Oh that's awful. Have you confirmed that it's something seasonal vs. possibly something in the house or larger environment? For example I've had worse asthma problems due to pollution near my office -- concrete dust from parking lot renovations in one building, air pollution from a nearby asphalt plant at another.
I sympathize with the long painful process of figuring out the cause. I spend way too much time playing the "what am I allergic to now" game.
- Gray 2010 carbon WSD road bike, Rivet Independence saddle
- Red hardtail 26" aluminum mountain bike, Bontrager Evoke WSD saddle
- Royal blue 2018 aluminum gravel bike, Rivet Pearl saddle
Gone but not forgotten:
- Silver 2003 aluminum road bike
- Two awesome worn out Juliana saddles