Try looking into stinging nettle supplements. I know my Mom had terrible allergies in spring and fall, and now takes nettle daily for a month before, and during the change of seasons. Her allergies are much improved. She read about it in a Dr. Andrew Weil newsletter.
Also, for myself, I make the following Hay Fever Tea. I know everyone says don't use sage during lactation (it can dry up your milk) I use very little and it has not effected me:
Goldenrod
Red Clover
Mullein
Nettle
Cinnamon Fern
Sage
I swear by it.
Hydrotherapy may also help.. Try steam inhalations or just rinsing your face first in cold then in hot water repeatedly and see if that doesn't give you some relief.
Hope you feel better soon!
Mary