hi there, you might be suffering from gastric reflux
disease in which the esophageal sphincter is lax causing food to regurgitate from the stomach especially in a recombeant postition, First of all you need to lose weight if you are over weight as it is commonly seen in obese
people, next you need to make minor changes in your life style. TRy eating small meals preferably less in fat and spices at frequent intervals, next always give a gap of 1-2 hrs between your bed time and your supper. Take a stroll if possible after your meal. Do not lie down immediately after any meal. You may use metoclopramide
tablets which increase the sphincter tone to reduce reflux along with your antacid
and other medication prescribed by your doctor. Hope these help. Take care.