I just got back from the ENT to see about my continuous sinus pressure and infections. Because the pressure, headaches, and ear pain and dullness have returned, he's put me back on antibiotics and steroids, also ordering a CT scan to look at my sinuses (his scoping today revealed a deviated septum but no polyps--yay, TMI). I don't really know what comes after that. I'd love tubes in my ears so I can hear better again, but I don't think that's in the cards.
Anyway, after some experience and evidence, I've realized that dairy increases my stuffiness (I had an IgE/allergy test previously for all the inhalants like dust, mold, pollen, cats, etc but am not allergic to those). So I'm doing an elimination diet, giving up all dairy, which essentially leaves me a vegan (well, I guess I get to keep eggs, which is very un-vegan like!). I had toyed with that earlier in December before the holidays, before the sinusitis. We'll see if it helps.
But first I had a very cheesy lunch! The last for a long time.
UPDATE: A friend has recommended eliminating gluten as well. Which leaves . . . not much.