Never go to bed right after eating.
Never eat a big heavy meal, eat more frequently if necessary but smaller portions that are easier to digest.
Stay away from caffeine including chocolate and soda.
Stay away from fried foods.
Stay away from spicy foods.
Stay away from gassy foods.
Never sleep or lie down flat. Use at least two pillows so you have a gravity situation where the acid is not as able of flowing upward.
See your doctor to discuss prescription meds if OTC medication does not work for you.