I know HN hates anecdotal health advice.. especially natural stuff.. but order yourself some Stinging Nettle powder or grounds, loose, and make yourself a decently strong tea everyday. I personally drink a liter, but I've had friends helped by just one cup daily. I had strong seasonal allergies that for 3-5 months of the year would leave me in sneezing fits, or drooling liquid out of my nose, or just with a constant itch in my nose. After years of stinging nettle drinking, on the worst days I have small symptoms. A skeptical friend was finally convinced when we went hiking in an area that started to even bother him, someone who had almost no allergies ever, yet I had half of his reaction.. and he had known how sensitive I was prior.

Obviously there are many types of allergies and who knows if it works for you.. but worth a shot.