@mary80... It is very scary to hear this diagnosis. If you accept treatment and follow the recommendations, you will continue to live a long life and be able to care for you children. This is not a death sentence and new information is coming out all the time. I have been free of MAC and have managed Bronchiectasis for 10 years without an exacerbation or recurrence. It was uncomfortable taking the "Big 3" antibiotics, but they worked.
I have asthma and nebulize twice a day and spend a little extra time doing postural drainage. I use this time to work on my computer. Your situation with little children is a complicating factor, since they will likely expose you to respiratory infections. Vaccinations are very important. Keeping them out of daycare may be a necessity. You have to balance your health against their need to develop immunity to colds at an early age. My children were at home until they went to kindergarten. They did catch as many colds or more than other children, but were better able to handle them at 5 years old. You can find a way to handle this situation. Please do not be afraid. You will find help with this group.