As a real novice in this group and to treatment, I'll share that this sounds like the kind of coughing I was doing last year when the pulmonologist diagnosed H-infulenzae. I couldn't change position, lie down, sit up, talk, or eat without triggering a coughing fit. After a week on Doxycyline I mostly cough while doing airway clearance. MAC diagnosis came back a few weeks later from the same sample, but since cough and fatigue are so much better, for now I'm just doing airway clearance.
Anna