Long-term Gas and Acidity Issues After Eating Canteen Food - #48695

Iam suffering from gas acidity and indigestionfor 15 yrs and also feeling gharat and bechaini in mind when ever I eat canteen food. When I eat home food I feel n problem. From 5 years, when I eat canteen food, I feel light pain in left side of beneath javal, but after 3 to 4 hours it disappears.But when I eat home food ,I feel no pain. Till now I feel only light pain in left side of naval,beneath the stomach,but it disappears after some hours, only when I eat junk food or some spicy food. Can U please Identify what is the main problem.