These are the following symptoms, please give a diagnosis.
The stomach is swollen. Nothing else is swollen. I do not have gas and have had all of the test : colonoscopy, esphogeal test and MRI. The swelling moves from the left side to the back when I lie down at night. What could be my problem

Optional Information:
Male , Age: 82

Already Tried:
nexium, prilosec, gas ex. Colonoscopy, MRI & esphogeal pictures, test for ulcers