First and for most you will have to make some primary change in your diet. This seems like chronic gastritis
. Go on blunt diet for some days. Eat only curd rice or moong dal khicidi. Avoid spicy and non veg food. Eat small meal. Even if you are hungry eat half the plate and eat rest half after two hours. Take fruits and veg soup in your diet. eat small mini meals. drink 2 litres of water and finish your dinner by 8pm. Do this changes for a week and then we will have to shift to maintenance diet.