I don't like to take allergy or sinus medication. The side effects, including everything from a "duh" feeling to the munchies, are just not worth it to me and the medications never really seem to help anyway. I have found that sinus irrigation is quite helpful, though. When I've been outside a lot and allergies are really bugging me, I use a sinus rinse bottle. It also works well to help keep things clear and prevent sinus infections when I have a head cold. This thing is fantastic!
This NeilMed kit includes the sinus rinse bottle (they also sell a neti pot version) and a bunch of sinus rinse saline packets. There are no drugs in the rinse packets- it is basically salt and baking soda. You can buy the NeilMed kit just about everywhere (drugstores, grocery stores, Target, Costco, Amazon.com, etc.).
I highly recommend using something like this first thing in the morning and about 30 minutes before bed when you are having allergy or other sinus issues. I also find it helpful when I have been outside for awhile and am feeling allergic to flush out the pollen, etc.