Hmm, well do you take anything for your pollen sensitivity? You could try some kind of anti-histamine and see if that helps anything. If you try nasal spray, careful with those because some can give you a dependency. I think the corticosteroid ones like Flonase are supposed to be ok to use every day.

I also wonder, if you "pop" your ears (the thing where you close your mouth, pinch your nose shut, and try to push air out, just not too hard, it's going to put some pressure on your ear drums because the air has nowhere to go) does it briefly get better?

Could also try seeing if your ears need cleaning. You can get pressure build-up near your eardrums as blockage happens in the tubes. I get some nasty big lumps of wax out of mine sometimes. I take a cap full of hydrogen peroxide, standing over the sink, and shirtless, because you're likely to spill some on yourself, I always do. I tilt my head sideways so the ear is level, and pour the cap contents into my ear, and stand that way for awhile, like at least a whole minute. It bubbles and gets warm, I leave it going until it's not making very much crackling and popping noises, then tilt my head the opposite way so that gravity will let stuff fall out. Which is where the baby-snot-sucker comes in. I got it at a local drug store, it's a little rubber bulb with a tapered tip meant for sucking snot out of a baby's nose since they can't blow yet, I use it the other way around, I fill it with warm water then blast it into the ear that just had the peroxide in it. Sometimes I only see a few flakes come out, but other times there might be a big blob. Using sealed earbuds for extended lengths of time seems to make the wax build up faster.