I have gone thru the same. My doc has me taking 2000-5000IU of B3 a day. Still tired but at least move around in a longer spurt than I had been. Good luck.

I have had bronchiectasis for four years now - contracted unknowingly through an h-flu infection sometime earlier. I get quite a lot of fatigue that varies by the day. Some days better than others. It seems to be related in part to the level of unexpelled mucus I'm carrying. And in part it's how well I feel oxygen is circulating in my body. Better circulation means more energy. Fortunately, for many years from before getting bronchiectasis I have practiced almost daily yoga. Nothing complicated just a couple of basic yoga sets - each about 20 minutes. Both include 5 minutes or more of deep breathing exercises. They help me expel mucus and improve my energy level. I try to do them most days of the week. Continuity helps. I do my yoga at home using programs on dvd. The ones I generally use are : Rodney Yee's AM Yoga, and his Abs Yoga. The latter is more strenuous but very good for expelling mucus. To get flexible if you've never done yoga, try Jane Goad Trechsel's Ten Minute Cup of Yoga first. It takes some persistence to get into - be prepared to spend a week or two learning the ropes. But I have found it well worth it. I hope this is of some help. Good luck.