I've had brain surgery was completely under but I was fine. These people go through years of college, many of them sleepless nights to be able to be good enough to get into medical school. Then once they get in they spend just as much time practising and learning so they can get it right when they have to see the real thing.
Of course, it's just that having something wrong inside you is scarier.
I have never had surgery of any desc<x>ription so yes I think I would be more than a little apprehensive.
I booby trapped my organs