Your Nervous System Isn't Broken—It's Managing a Biological Storm
- Jennifer Berryhill

- Feb 8
- 7 min read
Updated: Feb 8

You've done the work. Maybe you've been to a therapist, done somatic healing, meditation apps, yoga, breathwork, or nature walks. You know how to regulate your nervous system. You've built those skills over years.
So why are you suddenly crying in meetings? Why can't you find the word for "refrigerator"? Why does your heart race when nothing is actually wrong?
Here's what no one tells you: midlife women are not lacking leadership capacity or self-regulation skills. Their nervous systems are managing hormonal chaos that creates constant low-level activation.
Let me introduce you to my client, Emily (not her real name).
Emily is a VP at a tech company. She's led teams through acquisitions, product launches, crisis management. She's practiced yoga for 15 years. She has a therapist. She meditates. She knows her window of tolerance and how to stay inside it.
Or at least, she did.
At 47, Emily found herself unable to sit through a standard business meeting without her mind going completely blank. Not distracted—blank. She'd look at her team and feel inexplicable waves of anxiety about decisions that used to come easily. Her sleep became a disaster. She'd wake at 3 AM with her heart pounding, no obvious trigger, just...activation.
"I kept thinking I was losing it," she told me. "I've done so much nervous system work. I know how to regulate. Why isn't it working anymore?"
Here's the answer that changed everything for her: It wasn't working because her hormones were actually rewriting how her nervous system functions.
The Biological Reality No One Mentions
Brain fog, emotional reactivity, inability to access calm—these aren't character flaws. They're nervous system responses to major biological shifts.
The women I work with aren't dysregulated because they're bad at self-regulation. They're dysregulated because estrogen and progesterone directly modulate GABA, serotonin, and dopamine. When those hormones fluctuate wildly—and estrogen can swing 40% in a single day during perimenopause—the neurotransmitter disruption happens regardless of how much nervous system work you've done.
A woman who's done years of somatic healing will still experience brain fog when estrogen tanks.
Not because her healing wasn't real, but because her brain doesn't have enough fuel. She'll still have sleep disruption when progesterone drops because GABA production is compromised. GABA is your brain's primary calming neurotransmitter, and progesterone is essential for its production.
When progesterone drops, your ability to calm down drops with it. Not because you've forgotten your tools. Because the biochemistry that makes those tools work has changed.

Why Your Go-To Regulation Strategies Feel Different
Maria is a somatic therapist who teaches nervous system regulation professionally. She's processed her own trauma. She's built an integrated nervous system through years of practice. She knows her body's signals intimately.
When perimenopause hit, she still experienced everything: the brain fog, the emotional reactivity, the 3 AM anxiety wake-ups. She had a moment of profound crisis. "If I can't even regulate my own nervous system," she told me, "what am I doing helping other people?"
But Maria wasn't failing at regulation. Her nervous system was doing exactly what it's designed to do—responding to wildly fluctuating neurotransmitters caused by hormonal chaos. No amount of somatic skill prevents that biological reality.
What her years of nervous system work DID give her was something different: the ability to recognize what was happening without making it mean something was wrong with her. She could identify the activation for what it was. She could bring in her practices even when they felt harder to access. She could find moments of regulation even while the biochemical storm was raging.
Most importantly, she didn't lose herself in the chaos.
The women who navigate this transition best aren't immune to the hormonal effects. They just have more capacity to ride the waves.
They can work with their biology instead of fighting against it. That's the power of supporting both pieces—the nervous system foundation AND the hormonal shifts that are disrupting everything.
The Tracking Trap: When Your Ring Lies to You
Speaking of not losing yourself in the chaos, let's talk about the data many women are using to judge their nervous system health: Heart Rate Variability (HRV).
If you're wearing an Oura ring or another HRV-tracking device, you've probably had this experience: You feel relatively calm. You slept okay. But your HRV is "low" and your device tells you you're stressed and need recovery. Meanwhile, yesterday when you felt absolutely wrecked, your HRV was "optimal."

What's happening?
HRV measures the variation in time between successive heartbeats. It reflects the balance between your sympathetic nervous system (which drives the fight-or-flight response) and your parasympathetic nervous system (which controls rest and digest functions). Generally, higher HRV indicates better stress resilience and overall health, while lower HRV suggests increased stress and reduced ability to respond flexibly during challenges.
That sounds straightforward until you realize: all those HRV algorithms are calibrated to male physiology.
Dr. Sarah Szal recently shared in her recent newsletter that a meta-analysis of over 63,000 people that revealed something fascinating: "Despite having higher resting heart rates, women show greater parasympathetic dominance. Higher HF power. Lower LF/HF ratios.
Better vagal modulation. On paper, women's HRV looks 'worse' because we have lower overall variability. But that's only if you're measuring against male norms. The female heart operates with a different autonomic balance—one that may actually be cardioprotective. This is why women have lower cardiovascular disease rates despite having faster hearts. But standard HRV interpretation doesn't account for this. The algorithms, the ranges, the 'optimal' zones—all calibrated to male physiology."
*HF refers to "high frequency" heart rate variability (associated with parasympathetic/calming activity), and LF refers to "low frequency" variability (associated with both sympathetic and parasympathetic activity). Women naturally show higher HF power and lower LF/HF ratios—markers of better vagal tone and parasympathetic dominance.
Your tracking ring doesn't know that. The "optimal" zones, the recovery recommendations, the stress scores—many are calibrated to how men's hearts work and miss the nuance of female physiology.

Here's another problem: many of the studies validating these devices were funded by Oura itself and conducted on small numbers of healthy young participants. That research may not translate to midlife women navigating the menopause transition or those already in menopause—women whose hormonal fluctuations directly impact heart rate variability in ways those studies never examined.
Add perimenopause into the mix, when hormone fluctuations directly impact heart rate and HRV patterns, and these devices can become sources of additional stress rather than useful data.
I've watched women override their own body wisdom because their ring told them they weren't recovered. I've seen them push through exhaustion because their HRV was "good" or spiral into anxiety because their score was "low."
Your body's internal signals—how you actually feel, your energy, your mental clarity—are often more accurate than devices measuring you against male norms and validated on populations that look nothing like you.
What Actually Matters: Recovery and Resilience
In her book The Stress Paradox, Dr. Sharon Horesh Bergquist emphasizes something crucial about how some stress can be good for us and is actually necessary for human adaptation:
"A key pillar of what makes stress good is being able to turn off our stress response after a challenge. I call this 'psychological switching.' Recovery after experiencing good psychological stress is essential to prevent the harms of prolonged stress, allowing stress hormones like cortisol to return to their baseline level, instead of remaining continuously elevated. Recovery is in fact the time that we learn and grow from stress."
Here's the thing about perimenopause: the hormonal fluctuations create constant stress on your system. Your body is responding to those shifts whether you want it to or not. What makes the difference isn't avoiding the stress response—that's impossible when your neurotransmitters are in flux. What matters is your ability to recover between the waves.
This is where nervous system work becomes essential.
The women who navigate this transition best aren't immune to the hormonal effects. They still experience the brain fog, the reactivity, the sleep disruption.
But they have more capacity to ride the waves without losing themselves in them.

That capacity shows up in specific ways. They can identify what's happening in real time—distinguishing between "I'm having a stress response to an actual threat" and "My estrogen dropped and my nervous system is reacting to that." This awareness alone prevents the spiral into "What's wrong with me?" that compounds the biological stress with psychological distress.
They also know the difference between needing to process something emotionally and needing to support their biochemistry.
Sometimes the answer is breathwork and somatic practice. Sometimes it's protein, movement, or rest. And often, it's both.
They can access recovery—Dr. Bergquist's "psychological switching"—even when the hormonal chaos makes it harder.
Most importantly, they work WITH their changing biology instead of fighting against it.
The Truth About Your Capacity
You are not broken.
You are not failing at regulation.
You are navigating a biological transition that disrupts the very neurotransmitters that make regulation possible.
Your nervous system is doing exactly what it's designed to do—responding to massive shifts in the chemical environment it operates in. The fact that you're struggling doesn't mean you lack capacity. It means you're human, and you're in perimenopause.
The path forward isn't choosing between nervous system work OR hormone support. It's both.
It's building resilience in your nervous system so you have capacity when the hormonal storms hit.
It's supporting your biochemistry so your regulation tools actually have something to work with.
It's learning to work with your body's signals instead of against them.
And it's knowing that the waves will keep coming, but you don't have to drown in them.
Ready to stop fighting your biology and start working with it?
The BrainGrace™ Method integrates nervous system regulation with targeted hormonal support—because you deserve tools that actually work for the transition you're in.
Book a discovery call to learn how we can support both your nervous system AND your changing biochemistry, so you can navigate this transition without losing yourself.
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