I have gastritis, always feel full but no pain. Even though I took a lot of medicine, I am still bloated. Can you tell me the cause and effective treatment for stomach ulcers?

I have had stomach ache for 3 years now. I went to endoscopy many times the doctor diagnosed gastritis and epigastric inflammation. I was hospitalized for 1 week, the doctor sent me home to take medicine, but after 1 month, the pain returned. So the doctor asked me how to definitively cure gastritis? I have such a stomachache but I still gain weight? I eat normally. Please advise, thank you.

The doctor asked me why the treatment of antral gastritis does not go away? Please advise, thank you.