Congrats!
Of course it is normal to freak out before any surgery. From my experience, what you can expect after surgery is what you already posted. You may or may not be sore. You may or may not have gas pain. You may or may not leave the hospital immediately following surgery. Every person is different and how every person responds to surgery is different. I had a lot of pain after surgery and had to stay an additional night in the hospital. I had my surgery 12/28/2010 and my only regret about the surgery is that I did not do it sooner. I began my journey in January 2010 at 251 lbs and as of today I am 206. This is the longest period of continuous loss that I have experienced in my life and I am very thankful for this wonderful tool that was placed inside of me. Best of luck to you with your surgery tomorrow. You will not regret it. I highly recommend GasX strips for after surgery!