Hello there, what you are going through is normal. I was so scared b4 my surgery... But its not that bad, honestly! I was banded on the 9th of April... The first couple of hours right after surgery were the worst for me, and that i was ok. It feels like you just had a c-section and can not use your stomach muscles. The gas is the worst of it all, very uncomfortable!! But they will give you awesome pain meds. My surgery was on Thursday and Sunday was Easter, and i was dressed and ready to go!
As far as the weight loss remember it did not come on over night so do not expect it to come off overnight! It is A LOT eaiser than you can anticipate! Be patient and remember after about 30 days of eating right it becomes a habit, just stick with it!
Good luck and don't worry you will do just fine!!!