I have been reading posts regarding MAC, acid reflux and GERD. I too have suffered with what I thought was acid reflux. Mayo conducted many, many tests and yes GERD is problematic. I was put on those horrible drugs for years and this was causing more of the problem. I found out I my acids needed for proper digestion was low due to these drugs. I found a group and Dr. Norm that has helped me get off these drugs and I feel so much better regarding this area. FAST TRACT DIET, Dr. Norm Rollibard. FODMAP diet is also another diet you may want to check out. Certain carbs can cause use to have acid reflux. I am treating my SIBO and GERD via the recommendations and have been off the drugs now for 9 months ( weaned my body off the drug I was using).I rarely take one tum. These drugs can also cause us to fall susceptible to pneumonia. Maintenance is key. You may want to check them out.