I am having epigastric pain with excessive belching that leads into rlq abd pain. i have had a gastric bypass done 8 yrs ago and a ulcer. what's wrong?

Many issues: Anastomotic ulcer, obstruction of pouch or small bowel, reflux, peptic ulcer, adhesions, cholecystitis, seek specialist care.

Ulcer or GB : The pain in upper abdomen could be an ulcer. You absolutely must avoid tobacco and Aspirin compounds. Might also be due to sludge or stones in gallbladder. You should see your surgeon to evaluate.