33 year old male

I have a history of minor stomach issues – gastritis and ulcers (about 10 years ago). about 11 months ago, I started getting a pulsing and gnawing sensation in my upper right abdomen. Went through blood testing, Ultrasound, and Nuclear test and all was normal. The feeling went away quickly after. Now for the past 2 months or so, I have had a few bouts of mild to moderate stomach pain in my upper right abdomen again (a little different this time). It is persistent and consistent for 2-4 days at a time – both times were after a period of poor eating (fatty foods) as well as alcohol consumption. I do drink moderately 1-3 times a week. Other symptoms include: greasy looking loose stool (although does not float), rumbling stomach, occasional sharp back pain which comes on quick and leaves quick, burps, and bad breath/taste in my mouth. After day 1 or 2 of this, I typically switch to a bland diet of cereals, breads, etc and it goes away. Any ideas?