I don't believe plant material is good for GERD as it raises acidity in your stomach in an attempt to digest it. Also, MJ does make you eat a lot more so you may want to pay more attention to what you eat so you do not raise the acidity in your stomach. The only thing you can do is manage and prevent the symptoms. Incline your bed so you don't have stomach acid creeping up your esophagus while you're asleep and take some antacids for bad cases of GERD. You want to prevent symptoms for as long as you can because medications such as antacids are known to damage the esophagus over long term. I believe marijuana has no use in this case and it may make symptoms worse if you do develop the munchies. Also, ask your doctor for prescription acid blockers that does prevent GERD altogether.