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It is likely that what you have now is gastritis - inflammation of the inner lining of the stomach wall . This is very common after viral infections of the gastro-intestinal system that you had earlier.
Please take Prilosec tablets, available without a prescription at any medical store - this will help decrease stoamch acid secretion and also decrease the inflammation.
Stick to a bland diet with minimal oil and fat . Drink plenty of fluids. Sipping cold water will help calm the stomach.
I hope this helps.
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