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It could possibly be due to duodenal ulcer
I would suggest you the following which will definitely help. Its likely you ae having drug induced Gastritis
1. Taking Combination Of Pantoprozole with Domperidone
will definitely provide you the much needed relief.
2. Avoid Spicy and oily foods
3. Eat small quantity frequent meals
4. Avoid tea/coffee/alcohol/carbonated beverages
5. Consume high fiber diet
6. Consume plenty of oral fluids
If the symptoms persists would suggest you to see a Surgeon for further assessment
In case you need any further assistance, will be glad to assist you.
Wishing you happy and healthy life