@juliawb Did you ever find a new pulmonologist? I cannot find any current protocol that uses these 2 drugs to treat Bronchiectasis, so I assume they are treating an infection. If so, do you know what it is?

Years ago, it was pretty standard to alternate 14 or 28 days on then off a drug like azithromycin to try to prevent infections, but as you have learned the side effects can be difficult to manage. In addition, overuse of the drugs has lead to greater antibiotic resistance. The gold standard now is daily airway clearance plus monitoring. You might find this document very helpful:
https://www.ntminfo.org/wp-content/uploads/2019/09/Guide-for-Patients-with-NTM-Infections-2019-09.pdf
Do you do airway clearance? Do you have regular sputum cultures to see if you have an infection?