@tracy111869 I would like to welcome you to Mayo Connect and second Rick's recommendation, "Concentrate on getting better, not on revenge." You are going to need all of your strength and energy to get to the right treatment and get healthy again.
Many, many of the posts in our support group begin with stories like yours or mine - I was diagnosed with "intractable asthma and chronic bronchitis" for 5 years before a sharp-eyed radiologist pointed out the bronchiectasis and "probable MAI" on an x-ray. At that point, I couldn't walk across the street without stopping to cough and catch my breath!
As for sputum cultures, they can be spotty - I had 3 samples in one time - one grew MAC, one grew, one grew pseudomonas - same day, same lungs!
Do you have access to a pulmonologist with experience treating MAC?