Hi Gloria, welcome to LBT! I am no expert, but I've been hanging around this website for a few months and have learned a lot and gotten a lot of support here. Glad to have you aboard.
I am lxg (Lynne), 65 years young and was banded in August 2008. So far have lost 60 lbs and feel so much better, I can hardly believe it! I joined a gym (Curves) and work out 3 X a week, gave away my old clothes and bought some new ones, and put on a pair of regular waistband (instead of elastic band) jeans today! I can also cross my legs for the first time in years.
I too had a hiatal hernia, which the doctor fixed during surgery and from that day on I haven't had any heartburn and no longer need to take prilosec or any acid relievers. I was also able to stop taking meds to control blood sugar (was previously pre-diabetic, now normal).
As far as post-surgery shoulder pain, I was told that getting up and moving around as soon as possible after surgery reduces the incidence of gas. I'm sure everyone is different, but I didn't experience any gas pain at all. There was some local discomfort in the area of my port placement incision but that was quite minor and went away in about a week. You will probably be given some liquid pain reliever to take for a few days following surgery and that should help if you do experience any discomfort.
The point is, I urge you to think beyond the surgery itself since that will soon be behind you and then you'll have your whole new life ahead of you. Your doctor will not approve you for surgery if he does not think you're a good candidate. Read all you can in these threads on LBT - it will help you learn how to make the band work for you so you can reach your goals.
Good luck, and stay in touch!