There are several threads/areas of interest that discuss your concerns and questions.
Notice under your post: "Interested in more discussions like this? Go to the MAC & Bronchiectasis Support Group.

Click on the blue words MAC & Bronchiectasis and in the long search box that comes up put words and thoughts in the search oval that you are interested in to find others who have answered your same concerns.
You may have others that find your post and answer here also.

Have you been shown how to huff cough to clear the mucus? A regular cough is not the best thing to do to clear the mucus from the lungs and trachea. If you don't know how to huff cough place those words in the search box and see if something comes up.
Barbara