Sounds familiar, and to repeat PPs I recommend a neti pot. I have pretty bad dust/pollen allergies and am trying to avoid drugs where possible. The idea of a neti pot freaked me out before, but I figured it was a worthwhile try at drug-free management of sinuses.
Boy does it work! After spending a week at my parents' dry and dusty house for the holidays, both DH and I got sinus colds. I used the pot as soon as we got home, and could see (and feel) the results immediately). Now I just have a bit of a dry cough which is resolving with lots of tea. DH is taking drugs and has been miserable.
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