Kudos to your primary care physician for finding your MAC.
I was diagnosed almost 2 years ago and and the pulmonologist referred me to an ID doctor. I was told by both to start treatment but declined since I didn’t feel sick. The good thing is the pulmonologist had me start nebulizing with 7% saline. I have since gone to NJH and have found a local pulmonologist specializing in bronchiectasis and MAC. People on this forum helped convince me how important airway clearance is and I nebulize 7% saline twice a day. When I went to NJH almost 9 months ago, my sputum did not show MAC. I know it can come back and I am careful to take precautions I have learned here. I have not taken antibiotics.
I do not have reflux but others here that do may have suggestions for you such as raising your bed higher.