Barb, when you say you are coughing a lot, we all understand - been there ourselves. Do the doctors have you doing regular airway clearance, using saline in a nebulizer to loosen the mucus, then airway clearance techniques to loosen it?
This has helped keep a lot of people in this group healthy enough to avoid antibiotic therapy, and reduced some of the constant coughing.
Here is an excellent webinar on airway clearance by Dr Pamela McShane, an expert in treating Bronchiectasis and MAC:

Is is a little long, but well worth watching. She stresses trying a variety of clearance techniques until you find what works for you.