Hello, I think your idea of finding a pulmonologist is a very good one. I noticed in a previous post you said "I cough as hard as I can to bring up any mucus" That is not a very good way to do airway clearance because it can lead to sore ribs, sore throat and other issues, so it sounds like you could really use some coaching and a plan.

Here is a very helpful, but somewhat long video explaining the "whys" and "hows" of airway clearance from the World Bronchiectasis Conference a few years ago.

Now let's talk about antibiotics...NOBODY wants to be on them, but some of us need them. It might be interesting to read what some of our members have recently had to say:
https://connect.mayoclinic.org/discussion/macntm-is-different-for-everyone-treatment-might-be-different-too/
Also, since you posted under the topic of "Cavitary MAC" have you been told that there are cavities of infection in your lungs? The presence of cavities is one of the key reasons for deciding to treat with antibiotics, because it means the infection has been there for a long time, and may be hard to clear.
Sue