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For the acid reflux problem, you can take Pantoprazole 40 mg once daily for a week.
You can restrict excess spicy foods in diet. Cooked oatmeal help in soothing the stomach. Curd can be included more in the diet.
Gas forming foods should be restricted like cabbage, cauliflower, onion, turnip, etc. Eat slowly and avoid excess carbonated drink intake.
If you still have diarrhea, then stool routine micro examination has to be done. Before starting the H.Pylori kit, confirm H.Pylori infection by urea breath test.
You can be prescribed Zexid syrup (Magaldrate and Simethicone) for stomach bloating and follow the above advise.
For more information consult a general practitioner online --> https://www.icliniq.com/ask-a-doctor-online/general-practitioner