I have severe asthma and allergies. I am basically allergic to my entire environment. I always have a huge flare whenever my environment changes. The exertion doesn't help either.
However, the only time I have ever used a wheelchair was 6 months post brain surgery because I was still having balance issues.
I usually just go at the pace I can. We just went this past December and I had a massive flare while there (actually turns out I had viral bronchitis but did not know until we got back....). I would do a nebulizer treatment (pulmicort and xoponex) in the AM, go to the park until lunch, go back to the hotel and do an afternoon nebulizer treatment and rest and than go back to the park at night. I would then do a neb treatment before bed.
I am expecting things to be pretty similar when we go in June but hopefully without the afternoon treatment.
Unfortunately, unless you get a wheelchair there is nothing the GaC can do for you. If exertion is the biggest issue a wheelchair ir
ECV might work but if the heat/humidity/allergies is the biggest issue, the only option is to take frequent breaks and do treatments/change meds if necessary.
It can be psossible to tour WDW successfully with asthma and allergies. It just needs some planning and understanding of triggers.
I don't consider my asthma a disability. It's an illness but not disability. I spend on average 10 days/year in the hospital for asthma plus I'm on about 8 meds for asthma/allergies and I still don't consider it a disability. I figure if I can finish college with asthma, I can tour WDW. But that's just my view on my own personal history.
Good luck