I occasionally have burning pain in some part of my abdomen, on the left side just above the belly button , and constant aching all over my abdomen when I press it with my fingers. I have also tested positive for H pylori and taken the necessary course of antibiotics ( I need to have a new test to see if drugs took care of H-pylori). My doc once mentioned endoscopy. Considering my symptoms together with food allergy, can an endoscopy be really necessary and valuable?