Purely anecdotal, but I had surgery a few years ago (relatively minor). But I could feel for months after a sort of 'unconscious PSTD' I don't know how else to describe it. Even after it was healed and the pain was gone, there was just a deep sense of 'something bad happened in there' feeling. I'd have dreams of someone digging around in my body. Anyway, it's all gone now, but a weird experience for sure.

PTSD can happen especially when something goes wrong with the anesthesia. Happened to a man named Sherman Sizemore many years ago: https://www.nbcnews.com/health/health-news/family-sues-after...

Dramatized retelling of the story at 21m04s: https://m.youtube.com/watch?v=ny_s07D-LT8&t=1264s

I have vivid dreams and smells from a surgery where the visions and feeling of them poking me are incredibly intense. The question is whether it’s a memory or a manifestation of fear. I rarely dream (every few years), but this vivid dream comes through on occasion.