L.S.
Oh boy have we been down that same road. I swear we tried every allergy med out there: singulair, flonase, claritin, zyterc. All to no avail. My son is now 5 and he takes no Rx meds anymore. We used 2 non-invasive alternative methods that worked like a charm. NAET and homeopathic drops/tablets from bioAllers. My son too, was allergic to dogs, tree pollens, ragweed, dust, etc., etc.
We started the NAET last year and after a few Tx he was fine. Occaisonally he has a minor flare that we treat with the bioAllers drops *available at drugstore.com*, and he's fine
Best Wishes.