my advice is do not use GH in your case obviously GH is messing with your immune system on its own directly or indirectly with cortisol....too complicated with cortisol believe me i have been reading alot on it about immune system, eczema, allergy, ibs....in your case its worse than my problem (skin rash/ibs),,,asthma is no joke and allergy sucks....GH is not worth it IMO
first of GH will not get you HUGE,, shit i will be a big mofo, shit there will 10000 big mofos around so easily.
you are just going to have to find another way, natural way or find other chemical that wont mess with your immune system.
also AAS will mess with cortisol, some rasie some abolish, both cant be good in your situation.
see a doc get your allergy and asthma under control as well