Bro that sucks
You could have added this to the other Asthma thread, would be easier for folks to chime in… 
Seek a second opinion, maybe a doc that has a specialty in EIA or maybe at least is an endurance athlete of sorts. This may be hard to find but you get my flow.
Try a chiro, I go weekly just cuz I could and being stuck on the trainer causes me to have knee imbalances.
Wondering what training plan you’re on and racing you’re targeting…
Also I don’t put a fan in front of my face either because of similar issues.
But no I don’t experience these same symptoms 