I was banded on 4/30/08 and have been having the same disturbing symptoms you have described. I actually feel worse today. I have the "I think I want to burp, but I can't" feeling, pain in my lower left abdomen, pain in the middle of my chest that feels constricting, back pain opposite the chest constriction,pain in my shoulders and neck, and other odds and ends of discomfort!
I hope this is over soon. I'm in grad school and I need to finish a final paper this week and I can't sit at the computer because it just hurts too much!! It's encouraging to hear that I am not the only one experiencing all this.
I know it will be worth it soon! Beth