I don't think weight loss is a thing with bronchiectasis but it definitely is with MAC. I went from 135 to 113 over the course of about 3 years, not thinking too much about it because I was happy to be losing weight and my PCP wasn't concerned. That is, until I lost the last 5 pounds in the course of a week! That woke my PCP right up! He ordered a chest Xray (which he should've done years previously after my frequent complaints of coughing). The Xray showed bronchiectasis, which then led to a CT which showed possible NTM. Long story short, it took me over 2 years to regain most of the weight. I'm now at 128 and happy about that but it took a lot of work. At first I had no appetite at all and had to force myself to eat. At the same time I was taking meds for the MAC. I knew the MAC was gone when I started putting on weight and my hair started growing again.

Keep eating healthy food and lots of protein, even if you don't feel like it. The weight will come back, I promise.