Hi welcome to Health care magic forum.
Thanks for asking a question to H.C.M.Forum.
You are getting stomach pain, and to the back, it comes and goes, vomiting
sensation, but no vomiting. Gastroscopy, U.S.G., colonoscopy
, appetite and bowel movements are normal.
It appears to be functional, as there is a history of cancer you might be feeling the pain. Besides i advise you to follow some recommendations.
Avoid taking more of spices, junk foods, and oily foods.
, reading books of your interest, and hearing music. Try to mingle with people as much as possible.
Wishing for a quick and complete recovery.