Oh what a drag for Jonah and you. I totally understand you being cautious about the allergy label. Do you have any naturopathic doctors in your area? I have one in MI that I still use even though I live in TX now. She's wonderful and I trust her so much. I also have had chiropractic adjustments since I was a baby and I've been getting Quinn regular chiropractic adjustments since she was 8 days old and I couldn't sing the prases of chiropractic enough. Some people think it's a load of crap, but I am such a firm believer in chiropractic.
I know chiropractors can't prevent allergies but they CAN prevent ear infections and help clear up sinus congestion. My mom used to get ear infections (as most kids do) but neither my brothers nor I have ever had an ear infection as a child. My husband and his whole family always got ear infections as well, and Quinn hasn't ever had an ear infection. I am absolutely certain it's from getting chiropractic adjustments since she was just over a week old. I know you didn't mention Jonah getting ear infections, but those little tubes are all connected. Getting everything back into allignment could do wonders in helping prevent (and clear up) any infection.
If you are not open to trying chiropractic and/or naturopathic medicine, disregard this message, but I thought I'd mention it just in case you might be open to trying it.