Hello Jennifer - your feelings are very normal for someone newly diagnosed with a little-known illness.
The others who use/have used Arikayce can chime in here, but I'm pretty sure you need to report loss of voice to your doc. He may modify your regimen or have you take periodic breaks.
I should mention that Traditional Medicinals brand has 2 great herbal teas that can help - Throat Coat soothes the throat and Breathe Easy, which I drink every day, helps loosen mucus to clear lungs. They are available many places in the tea aisle - including Supermarkets, WalMart, and on line at Vitacost.com
Sue