Hi., I can understand your concern.
As you said, can be due to Gastritis.
Will be fine with medicine.
Take
Tab drotin 40 mg twice a day after food for 2 days.
Tab razo d once morning before food for 5 days
Syp. Sucrafil o twice a day before food for 5 days.
Health Tips
avoid oily spicy processed and outside food items.