No firm diagnosis, but CT's suggest MAC Questions

After several years of having postnasal drip and cough, a chest CT last summer showed tree-in-bud nodules, mucus plugging, ground glass, etc. The radiologist said it was suggestive for atypical non-tuberculosis mycobacterial infection. I saw a pulmonologist who thought the significant post nasal drip could be contributing to/causing the CT findings. He said the "least" I have is asthmatic bronchitis and started Stiolta, Azelastine, and Mucinex and the cough and post nasal drip have decreased significantly.

CT was repeated in January and showed:
"1. Waxing/waning infection/inflammation throughout both lungs, probably related to chronic atypical infection/MAI, with overall improved bilateral lower lobe findings aside from a new left lower lobe cluster of tree-in-bud nodules.
2. New masslike atelectasis in the lingula."

Pulmonary doc called after the last CT results and said he didn't "think" I had cancer, referred me to ENT to help with improved, but persistent, PND and increased Flonase. Sinus CT showed sinusitis and I started Augmentin and Prednisone for 10 days and will get allergy testing. ENT doc doesn't think chest CT findings are from PND mucus, though said an infection could seed from sinuses thru blood.

Pulmonary plan was for a repeat CT in April and if no improvement, a bronchoscopy and a PET scan. We have discussed how tough MAC treatment is. My one tiny sputum culture showed just flora, though initial smear had trace mycobacterium.
PROBLEM: I called to schedule the April appointment last week and was told pulmonologist is out on emergency leave thru April and office has no one else to schedule with. They gave me a May appointment.
I''m feeling impatient for a diagnosis, esp. since ENT doc seems to think something else is the cause. Pulmonary doc didn't want to do CT after 2 months in case because that would be too soon for a slow going malignancy to show. I called Mayo and they have openings in March and April if I can get a referral. I'm hoping NP will give me one on Monday.

Questions: 1. Did anyone else have PND considered as an explanation for abnormal CT before diagnosis? I found mostly older research from Japanese docs about "sinobronchial syndrome," which sounds similar to mine, but it seems either a dated diagnosis or one US docs didn't agree with. I am retired nurse and know aspiration is an issue for sick, but my cough reflex seems quite good! : )
2. Am I being too impatient? Is it reasonable to go to Mayo at this point? I just want to get tests done, get a diagnosis and a plan made. If you've been, are my expectations that I'll get a diagnosis reasonable? I haven't been in 20 years, but was impressed then.
3. Do any of you have family members with MAC? I know it's not contagious per se, but I read about clusters. My mom was thought to have it and her chest CT's reports looked much like mine. She was too old/frail for a bronch when it was found. I also think my dad may have had the cavitary type. In the pre-CT days, he had his lt. upper lobe removed for a lesion thought to be cancer, but wasn't and final was that it was "like TB, but not contagious."

Does anyone have any suggestion for clearing out my lungs in addition to the meds? I do walk a few times a week.
Sorry this is so long...