As Michelle knows, I second the raw local honey. It's worth a shot. We deal with Fall seasonal allergies only. Tried the local raw and seriously saw outstanding results in about 10 days, didn't even need the benadryl.
Fall of 2011 he did end up with a secondary skin infection, so you do want to watch out for that, it needs to be treated.
Good luck...it's sometimes hard to pin point the cause.