Drink cold milk. Avoid heavy meals and
eat frequent small meals. Avoid too much of caffeine, tea, smoking, fried food and drinks both alcoholic and non alcoholic fuzzy ones. Avoid heavy exercises within 4 hours of a heavy meal. Raise the head end of the bed by pillows to 30 degrees. Avoid lying down for least 2 hours after food. Maybe these tips will help you.
If these tips do not help, then liver function test, pancreatic enzymes, and HIDA scan for gall bladder should be done.