The first time, I did not know what was coming. They operated on bones in my foot. Gave me a spinal block. When it wore off, they asked me to walk — on crutches, on the foot that had just been cut open. I made it a few steps. And then the world went black. Not metaphorically. I literally fainted. From pain. That was surgery one. There were three. And there is a fourth I need — and cannot make myself do. It has to do with a specific molecule in the neurons of my spinal cord. Once you understand what that molecule does, the fact that I cannot walk back into that operating theatre will make complete neurological sense. It is not a failure of courage. It is a consequence of learning.

There is something that happens in a crisis that nobody really prepares you for. Time does not just feel different — it is different. The room slows down. The details become too clear. You notice things you have no business noticing when everything is going wrong. This is not a glitch. It is tachypsychia — a specific neurological event driven by norepinephrine — and the science of why it happens tells you more about the female stress response than almost anything else in the literature.

I have always had a lot of fears. And since a young age I have been adamant about overcoming them. Not tiptoeing around them. Collecting them. Every time I collect one — every time I do the thing and survive it — something happens that still astounds me. How easy the second time is. How there is almost literally no stopping me. I always thought this was a mindset. It is not a mindset. It is fear extinction — and the female brain is specifically, hormonally primed for it at particular points in the cycle. Here is the science behind the thing that has helped me most.

Every heartbeat is a voltage wave. Every pain signal is physics — charged particles crossing a membrane, a signal travelling at the speed of a sprinter. Your body is not just biological. It is electrical. And the physics runs differently in you than the textbooks have ever accounted for.

There is a belief I held for most of my twenties that I no longer hold: that my brain had a ceiling. That the capacity I had was the capacity I got. I know now that this is not how the brain works. Neuroplasticity does not pause for difficult years. And in the female brain, it runs on a hormonal architecture that science is only beginning to take seriously.