Hi welcome to Health care magic forum.
Thanks for calling H.C.M.Forum.
You have got a pain in upper right abdomen at rib cage
, not related to food, or food timing,It is dull pain and aching when you sit or in sleep. You got operated gallbldder in 1989.
It appears to be the pain of pull, means may be due to adhesion
, or herniation. For diagnosis you may need to get leprotomy ( opening abdomen and searching the cause.) as M.R.I, and C.T.scan failed to find the cause.
I advise you to consult a general surgeon
for diagnosis and treatment.
Wishing you a quick and complete recovery.