Getting Very Nervous

Well surgery is only a few days away and I am really nervous. I am not sure what I'm nervous about though. I guess a part of me is worried about something going wrong on the operating table and a part of me is worried about pain post - surgery. I think I am also worried about my success afterwards. NOthing else has ever worked - long term. I am afraid that I will be one of those people who will regain the weight in 5 yrs...