Lung problem that can't be figured out by my docs...?

Since January I've had "exercise dyspnea", where I get short of breath upon any exertion.

I saw my primary doctor who did all kinds of blood tests, including tests for RA (neg), Alpha1 Antitrypsin (slightly elevated), and various other disorders. She also sent me for a V/Q scan (neg), CT scan (showing a lower right lung nodule of 3mm), MRI (neg), HRCT (awaiting results), stress echo, and a PFT (I'll list those results below). I also should mention that while walking around with a pulse oximeter on, I dip into the high 70s, low 80s, but it's noted that I resolve back up to 93+ when I take a deep breath and stop walking.

The results of my PFT are as follows:
FVC - 95%
FEV1 - 93%
FEF25-75 - 86%
PEF - 92%
FIVC - 89%
VC - 95%
TLC - 71%
RV - 28%
RV/TLC% - 13
FRC Dil - 64%
DLCO - 56%
DLCO/VA - 98%

My history: 34y/o, Native American/Cauc., T1DM, hypertension, no enviro allergies, A1c is 6.0. The pulmonologist had me on different asthma meds and Singulair, none worked. Have any ideas??

You may have just damaged your lung somehow, im 18 and when i was 4 i choked on a sweet, now they treat it as asthma, i cant run far, or swim very fat without loosing my breath, ask for an x-ray on your lungs. Good luck.

Out here there's something called "valley fever" same kind of issues, no real reason, no cure. The ONLY correlating factor is ALL the people that have this, LIVED here at one point in their lives.
FRESNO and it's surrounding area

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