I was diagnosed with Mac earlier this year and also have GERD/Refulx. Last month I went to National Jewish and saw Dr Huitt. She thinks my Mac is from the Reflux. She believes if I make some changes in my diet and lifestyle it will go away on its own without treatment. Some of the big changes are ....no sleeping on my right side, no more than 6 ounces of fluid per hour, no drinking or eating 3 hours before bed, no bending over, sleep with my bed elevated 30/40%. The diet is pretty simple but strict. No Caffeine, chocolate, mint, red sauce, fried foods, high fat foods, etc. The best thing I ever did was to go to National Jewish for a consultation. They check out everything and try to find out the reason you got Mac. Hopefully I can get rid of this without taking antibiotics.