I had the Ileo Anal Reservoir surgery 31 years ago.  In the past several months I've had this issue, which is very painful.  I ate later than usual last night, and went to bed pretty full. (pork tenderloin, baked potato and boiled cauliflower) It was a miserable night, and my upper abdomen is swollen, hard and painful. I've only been able to have a very small (constipated) bowel movement.  There appears to be a lot of gas, as I have burped many times.  No leakage whatsoever.  Does anyone have any suggestions to relieve the pressure?