I lost it when I had to have surgery for a ruptured appendix. A totally routine surgery that's about as low risk as you can get. But my mind was focused on the extremely rare "what if's". Like a bad reaction to anesthesia. But it turns out your odds of dying from general anesthesia is around 0.0004%. Meanwhile your chance of dying in a car accident is 0.17%, and your chance of dying to lightning is 0.00045%.

So roughly the same odds as being struck by lightning. But I'm sure you don't mind running outside to your car when there's lightning strikes. And I'm sure you get in a car almost every day.

That fear is strange though. I'm far more afraid of flying (which amounts to temporary shaky nerves) than going under for surgery (now) and flying is 46x more safe than general anesthesia. There's nothing rational about any of it.