Duodenal ulcers

I have a 7 year old dog who was diagnosed last June (after an endoscopy) with esophagus, stomach duodenal ulcers and possible IBS.  He doesn't have the usual symptoms of vomiting or diarrhea. just in extreme stomach pain at times.  My vet felt it could be from a food allergy/intolerance.  I was feeding Natures Receipe Lamb and Rice,  and now on a prescription diet of Hills d/d , salmon and potato and numerous meds. prednisone, ompeprazole, sucralfate, etc.  I was weaning him off most of the meds, (per vet) only 1-10mg Pred. and Omeprazole every 3rd day.  Did fairly well for a couple of months until last week, when we had another episode of extreme stomach pain.  So off to the vet again for some heavy duty pain meds. and back on all the other medication daily.  She again mentioned a food allergy as nothing in his blood test suggest anything either.  Could it be he has become allergic to the Hills d/d after eating it for 6 months.  Has anybody gone through this with there dog and if so, help what was the solution.  There is no reason for this happening that we can find.  This usually happen in the middle of the night or early morning.  Feeding twice a day.  Any feedback would help, at my wits end.

Thank you

MJR

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