Chronic gastritis an acid reflux

I have been a vegetarian (with milk) for the last 4.5 years, and have been suffering from chronic gastritis/acid reflux for the last 3 years. I am given rabeprazole, pantoprazole, omeprazole sometimes with domperidone for that. As long as I take these I am more or less ok, but as soon as the course is over, I gradually start having acid reflux, then fullness in the right upper abdomen, and then severe pain there. My diet on the whole avoids spice; and the average gap between foods is 3hours. 4 years back I had an anxiety/depression disorder and was treated with clonazepam 0.25mg for a year, with escitalopram oxalate for 1.5months. Now I am ok. But if an apprehension occurs, I (together with my father) am always more likely to be anxious/depressed than others are. What might be the cause of the recurring acidity/gastritis problem, and is there a complete cure? Thanks in advance.