Hello,
According to your history it seems you have hyper acidity (Acid peptic dz) and may be some erosions inside the stomach because you have pain while taking outside food. So first of all avoid outside food. You require diet modification and few lifestyle changes.
Next Steps
Take Medicines for hyperacidity for 15 days. If problem persists then UGI endoscopy.
Health Tips
Avoid hot/spicy/oily food. Regular walking after meal. Small frequent meals. Plenty of fluids.