It is normal to be scared! It's surgery! I went through all the "what ifs" prior to surgery plus my mom (God love her) was going about them out loud too so it was a difficult time.
It's actually good that you're a little scared. It means that you are aware this is something big. Here are some questions to ask yourself:
1. Do you trust your doc? If so, put the surgery in his hands. He will do a great job I'm sure.
2. Are you ready for the new way of life? I bet you are! Put any thoughts of failure out of your head for now. It's not going to happen. I was so afraid of failure because that's what always happened when I went on a diet. But guess what? This isn't a diet! This is a new lifestyle and you have been physically changed to make it work.
The hardest person on you is you! Put some trust in yourself for the next 2 days that you have made the right decision and it's not necessarily going to be easy but you will learn how to make it work for you.
We are all here for you! Hang in there!