Hi,
Congrats on not finding out your not allergic to anything, because I am allergic to pets, grass, weed, pollen, cotton wood and a dozen other things and it makes my Asthma a problem, which is even worse if you have AS breathing complications.
I haven't heard of AS Lung Disease either, but it sort of sounds like my occasional hyperventillating problem. Most of the time my breathing is shallow, but I also hyperventilate after doing certain activities. It's sounds like your doctor knows about AS and breathing complications.

Take Care,
James.

HLA-B27+, JRA diagnosis in 1981, re-diagnosed as AS in 1988. Also iritis, colitis, and psoriasis. NSD + low carb helps me. My health makes it hard for me to post in a timely way.