Thanks to all for addressing the fatigue AND confusion about whether to go on the Big 3 antibiotics. I was diagnosed with MAC in June, 2017. I went to Mayo in Rochester & was told to go on all three antibiotics. When I started the third one, I saw flashing lights/visual disturbances after my second dose. An ophthalmologist told me to stop the Ethambutol (I believe it was that one) immediately, that he'd had patients go blind "pretty quickly" from taking it. I just got my second follow up CT scan, which shows things about the same as last year. A pulmonologist at the University Of Kentucky gave me a strong talk last week about MAC being a "serious" disease (oh thanks, I didn't know that..) & that the sooner I went through 18 months of Big 3 treatment, the better chance I had at beating it before MAC progresses any farther. I decided, at this point, that the side effects of the drugs are not worth it. I am 60 years old & would prefer a shorter lifespan than years of blindness, if forced to choose. That being said, I too have variable fatigue. I push myself to exercise regularly but allow myself to nap as needed.