S.C.
I have suffered through a few decades of allergies, usually so much so that I couldn't leave my house some days. I haven't had any major allergy issues since changing what I eat (no sugar, no starches, no gluten, no soy, no grains, no dairy) and eating local honey (my sugar replacement). I haven't needed any medication this allergy season so far. I made the dietary changes to support my daughter who has autoimmune issues and follows a special diet, but I have also benefitted from it.
If you prefer the medication route, then Zyrtec, Allegra and Nasonex all worked best for me.