I had surgery on June 16th, close to your date. My gas pains have been the worst part of the surgery. The left shoulder pains started a week ago and have been consistant around bed time. They were soooooo bad!! My surgeon said its completely normal for gas to move into the left shoulder muscles. Weird I know. He did say if the pain gets really bad for too long then the tube attached to the band could be pushing on my diaphram and causing issues in the shoulder. Keep an eye on it. Mine have finally lessened and are rarely there.