Haha let me tell you. I had some minor surgery (appendix exploded) and they put me to sleep. The whole experience gave me an existential crisis. Basically I just went to the hospital alone in extreme pain. The nurses and doctors were all uncaring. I know its just their job and they see thousands a people a week or whatever, but man I was scared to go under. Like shaking even. They put the tube thing in me and counted down. Then just darkness. No dreams. No memories. Just hours of almost nonexistance while some people fixed my insides or whatever. Coming back from that is weird. I know its a common surgery and not a fatal or near death thing, but man I like existing and leaving like that--alone in a hospital with someone counting down your potential death is kind of unearving. I don't really have any advice for you. But recently I saw this clip again. It made me kind of happy.
https://www.youtube.com/watch?v=pelSih-1jxg