@equanimous You have found a great place here on Mayo Connect to help educate yourself. My personal experience with bronchiectasis and MAC involved 2 years of a chronic productive cough and a LOT of doctor visits and tests before finally being diagnosed. There are a lot of GPs and even Pulmonologists that simply are not familiar and up to date with our condition. If your Pulmonologist suggests waiting on the antibiotics, I would certainly go with that. The most important thing IMHO is for you to perform airway clearance (=lung hygiene) every day for the rest of your life. For me that includes nebbing with 7% saline (#1 most important) and using the Aerobika There are several youtube videos that will be very helpful, one of my favorites is this one https://www.youtube.com/watch?v=L-EHohMe7II One last piece of advise is to do all the other things to help make you healthier overall to include exercise, a healthy diet, stress reduction etc. Good luck yo you. Bill