Check for gallstones. I had that, crippling stomach pain, which was initially diagnosed as either gastritis or possibly an ulcer. However, after dealing with

Check for gallstones. I had that, crippling stomach pain, which was initially diagnosed as either gastritis or possibly an ulcer. However, after dealing with it for a couple years, I ended up in the emergency room. They ran an ultrasound, and found a number of gallstones lodged in the duct that connects the gallbladder to the stomach. Ended up having my gallbladder removed. Items that I remember triggering massive pain attacks include pizza (I thought it was acid from the tomato sauce, but it was fat from the cheese), and after eating a large gyro (lots of fat in it apparently). Fat causes the gallbladder to start pumping, and if there are stones it will lodge them in the duct causing the pain.