This sounds similar to gastritis. Have you had anything like an upper endoscopy?
I don't believe Healingwell has a gastritis forum, but I used to visit one at Daily Strength which was helpful:
Of course, maybe it's NOT gastritis or anything similar. I agree with seeing a gastro doctor for a diagnosis. He/she could likely help with this issue.
Feel better soon!
"All the darkness in the world cannot extinguish the light of a single candle."