Hi Marissa,
I am scheduled to have the procedure done on 11/27 and have nerves. This is normal. I would be worried about anyone who didn't have questions and nerves about any type of surgery. However, you must understand that pain is subjective and we all experience it differently. I would expect some type of pain if my skin is broken by any means. Also, answering all the other questions: all those things you are concerned about are very individualized to each of us so no two people will have the exact same experiences. Just think of "no pain, no gain," pray this prayer and do what you believe is right for you.
Strengthen me, your servant, O God, to do what I have to do and bear what I have to bear; that, accepting your healing gifts through the skill of surgeons and nurses, I may be restored to usefulness in your world with a thankful heart; through Jesus Christ our Lord. Amen.
A side bar: I am an ICU nurse, and have the opportunity of caring for patients post-op gastric bypass and I will tell you they are terribly sick, and have many, many complications. With the fears you have, this definitely may not be an option for you. Good luck with whatever decision you make.