I have it too. About 20+ years ago I first noticed it. It comes and goes. I would tell the Dr. about the pressure or sensation of being full or ache. They would just give me a look and say "That's weird" .
I have had a scope down my stomach, a biopsy, gallbladder checked and even a total cardiac work up. Nothing abnormal was found. I have gone to a chiropractor now and then and it seems to have helped. I have another appointment in a few days.
I'm curious to see if my chiropractor has heard of such a phenomenon.