First the pulmonologist, then the ID doc if 3x per week doesn't do the job. As for hearing loss, 18 months of antibiotics, first 3x per week, then 6 months daily, had very little effect on my already moderate hearing loss and past-moderate tinnitus. I was screened every 6 months for hearing, every 3 months for vision (also have glaucoma) and didn't have any notable adverse effects. My ophthalmologist said in her long career, she has only had a handful of people that had visual problems, and my audiologist said she only had to stop meds on 4 people.
So the risk is relatively low compared to the danger of lung damage.
Have you started airway clearance yet? It can sometimes knock down MAC to the level you don't need antibiotics.
Sue