I worked with a man that had it, unfortunately he succumbed very quickly.
But for your doctor to even mention stomach CA before you've had a scan or upper GI, you should immediately slap the shit out of him and find another Doctor.
Another of our patients has it and he appears to be doing quite well, I though he would be losing the battle quickly as his wife recently passed away and he took it quite hard. but he's going pretty good right now. I believe this is his 2nd bout with stomach CA.
The things Id look strongly at first would be an Ulcer, followed by or caused by H. Pylori infection. Have you even had a Scope done yet? If not id just forget the CA thing until you have Scope w/biopsy and a CT scan.
On CT the wall of the stomach will appear noteably thickened and often appear splotchy due to the different densities if its CA.
Have you tryed Prilosec over a month or so yet? Never mind i see that now...
If you truly have reflux id say you probably have an Ulcer.
Best of luck to ya in the meantime.
You want to know if its your gallbladder?
Go deep fry some fish, fries, cheese sticks, eats some bacon, and then some ice cream.
If you wake up in pain it is your gallbladder then...
What tests have you had so far to rule out the GB?