I had a tonsillectomy when I was maybe 4 years old, I remember my parents leaving me there, me screaming for them not to leave me, and being dealt with sternly by the pediatrician and hospital staff, and (I think) being held down because I was struggling. To top it off there was a small complication (the surgeon nicked my vocal cord so I was in the hospital for a week rather than a couple days and it was very painful). I actually don't have that much memory of this but I once went to a hypnotherapist who had me walk down a stairway (in my mind), open the door, and tell me what I saw there as relates to my hypochondria - as soon as I mentally opened that door I began sobbing about this tonsillectomy. I later called my older brother to see if he remembered anything about it and he said yes, he remembered me screaming in the hospital and my parents being told to go home, etc. I think that's when my health anxiety started, I feel like something disastrous is going to happen when I go for any medical appointment and I have the general idea that there is something wrong with my body and nobody has discovered it yet. My earliest memory of worrying about an illness was seeing an ad on tv (this was in the 60s) for amblyopia, some eye thing where the eye muscles don't coordinate, and worrying in an obsessive way that my eyes were not coordinated and I would have to wear an eye patch.