I think Horse Jounal had an article on ulcers and stomach problems. I'll see if I can find it, perhaps they can start without showing up in a blood test.
Ulcers are suppose to be very very common in horses, and very difficult to treat, of course, because they are usually caused from the stress of being used and trailered, so I've been told.
The vet that treated him when he coliced last year says there is a medication that can help prevent ulcers, horse prilacec (sp), and she gives it to all her using horses rather they have symptoms or not.
I may give that a whirl with him.
See if it helps. He has been somewhat of a hard keeper. I attritubed that to his other problems....poor guy has had so much go on, it's hard to know what to do for him. If he wasn't so good, I'd have gotten rid of him along time ago.
Becky
Oh, BTW, thanks for looking for the article, I'd be interested in reading it. Anything that might give me a clue:)
Becky