I was banded on the 20th and having similar experiences to you all. I still have some gas stuck up in my left shoulder, but it's really more irritating than painful. Today though I had sharp, shooting pain in my left ribs. The first time it happened, it caught me off guard and made it hard to get a good breath.
As for food...I'm on the full liquid diet until 2 weeks post op. Over the last few days I've had Water, Gatorade, broth, SF Jello, SF pudding and even SF frozen yogurt. I felt really guilty about the frozen yogurt though.
I'm down about 7 to 7.5 pounds since surgery. I did not do a pre-surgery diet.