Stomach pain. Tell me why and treatment?

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Stomach if acidity and bitter water in mouth may take pantocid dsr morning empty stomach  for backache take antiinflamatory or pain reliver

There isn't sufficient information to reach a specific diagnosis. I would advise you to visit the ER so that you can be evaluated and undergo investigations such as ultrasound or CT/MRI(if indicated) to find the underlying cause and have it treated. You would require an antacid. The following steps may help: - Don't skip meals, you may not feel like eating but in such conditions you should have the reduced amount in frequent intervals(i.e. 3 square meals broken down to 5 or 6 as you can tolerate) and slowly increase as you get better. - Reduce/ Avoid spicy,fried, fatty, junk and oily food - Avoid/ Limit drinking coffee, tea and carbonated drinks to once a day - Exercise regularly (minimum 30-45mins per day) - Increase daily intake of water to 3 liters - Avoid/Stop smoking and drinking if you have the habit - Reduce stress through methods such as yoga/meditation.