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This is not small gastritis
, it is mainly due to intestine problem. You could be having Irritable bowel syndrome
which is classical for the history you are providing. You need to avoid high sugar and rice diet. Try to stay away from wheat products like chapathi and see if any relief as well. Eat small portions of food every 2 hours instead of heavy meals. You need to reduce stress
in your life, do Yoga
, Pranayam, deep breathing exercises. Drink plenty of water and increase stool bulk by eating fresh fruits and green leafy vegetables in diet. There are good medication available but you need to consult a Doctor to treat Irritable Bowel syndrome.