Ppi and burning stomach

I seemed to settle and my only symptom was yellow dirhhea up to 6 times a day I took osmembrazole 40 g and that made my bowel movement was more solid and normal in color but i noticed i was slightly constipated i asked a GP and he said to take 20 Omeprazole for a month instead of osmembrazole 40g for 5 days but i noticed my burning stomach returned today esp after taking it and i noitced gas that is more than any of the 12 days i had gastritis Also i suspect its Chemical ( bile ) gastritis What could it be and what to possibly do