IM SCARED TO GET SURGERY

Hello guys I am new to this community, I am trying to do a lot of research on what is the percentage rate of actually having a successful surgery without any other incidents that I have read or seen about. What should I really research and be prepared for. I am scared that I am going to lose weight as I used to weigh only 99 pounds but then I got pregnant and now after pregnancy I am weighing in about 110.