The biggest bang for your buck is to work on your waistline. Obesity and subsequently loss of body fat will assist greatly in improving your reflux (SEE MACROS and our diet/fitness programming). Along the same lines, stress will greatly affect your gut function. The same signaling hormones in your body that control stress (serotonin, dopamine), also control the way your GI tract moves and shakes. If you manage your stress this will help manage your gut.
GERD or gastroesophageal reflux disease is a combination of conditions involving acid exposure outside of the stomach. Your body produces two Liters of stomach acid daily, which is needed to breakdown your food. In healthy states, this acid will then exit the stomach into the small intestine, where it will become neutralized by your pancreas. This acid is integral to digestion and also is antibacterial, killing those harmful bugs that try to get in your body through your dirty dirty mouth.