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Gastritis is an inflammation of stomach mucosa. It happens due to Helicobacter pylori a bacterial infection, smoking, alcohol and also certain medicines like Aspirin. Presence of diverticulum also causes gastritis.
You are taking good medicines to your concern, continue them. Preventive measures:
You can add Panchsakar Churna 3 gm twice a day with warm water after meals and Arogyavardhini Vati 1tab twice a day after meals.
Avoid spicy and fried junk foods, quit smoking and drinking if you have these habits.
There may be need of surgical removal of diverticulum.