Try being treated by a chiropractor. Having your neck adjusted can open the eustachian tubes and allow them to drain. I've treated lots of patients over the years during allergy season and this has worked for many of them. It usually takes 2-4 treatment until the eustachian tubes stay open consistently.
To address your allergies directly, I've had many patient who have gotten allergy shots from their allergist. It can be a long time commitment, (5 years total, I think) but in the end they are either completely not allergic to whatever they were allergic to before, or only minimally allergic.
One very simple trick I suggest to my patients with pollen related allergies is to wash their hair before going to bed. Strip your bed and start with all clean linens (wash your comforter, too). Over the course of the day, pollen lands in your hair and clothes. When you go to bed, some of the pollen on your hair falls onto your pillow and bed, so you are accumulating more and more pollen in your bed every day. If you wash your hair before bed, you're not carrying all that pollen into bed with you. Works best if your spouse does the same thing. This way, you're not breathing in pollen all night long.
Hope this helps.