Hello, Most probably a Gastroesophageal reflux disease. You should avoid fatty, oily and spicy diet. Have some walk after having food instead of taking rest. Have multiple small meals instead of heavy meals. Have regular sleep habits and avoid stress. Lots of green leafy vegetables, fruits. Avoid smoking and alcohol if any. You should have esomiprazole domperidone combination beforebreakfast once a day for 2 weeks rather than just prilosec. If not adequately relieved, then you should add Syr sucral O or gelusil two teaspoon three times a day for a week. You should also visit gastroenterologist once in order to asses need for endoscopy. Hope this helps you and get back if you have any doubts.