hi i had gone through your query and understand your concerns. i would come up with two possibilities.
1.the first one include,FLATULENT DYSPEPSIA
or ACID PEPTIC DISEASE;
-over usage of pain killers,corticosteroids
,antibiotics are the causative factors.
2.second possibility is,CHOLELITHIASIS;formation of gallstones within the gallbladder ultrasound
scanning for abdomen may confirm the diagnosis.
there is another possibility like PEPTIC ULCER;upper gastrointestinal endoscopy may confirm the diagnosis.
I hope this is helpful for you, thank you