Comrade, others have had good responses already so I won't try to give you facts/arguments, I don't know that much about the subject anyway. But I'll tell you about my experiences because they were all good, and hopefully positive thoughts will put your mind at ease.

I was in a very bad accident once where I was knocked unconscious in a brutal manner (think traumatic brain injury). And let me tell you, it is one of nature's great mercies that we are programmed such that I can't remember that accident at all. Not one bit. Not like going to sleep, just complete, utter blackness with nothing in the void. Perfect unconsciousness. I've also been anesthetized a few times and that's how I'd describe every one of those experiences: perfect unconsciousness with absolutely nothing registering at all. It isn't like sleep, it is something blessedly less active. I know it sounds weird to say but I'm very pro-anesthesia. We can't deny that things can go wrong, but this is one of those things like plane crashes - we fixate on what goes wrong (I say this as a nervous flier). Many more things go right. Hang in there!