As sad as the prospect makes me, I'm going to give up dairy products for a month to see if it will help with my sinus problems. I'm not really a milk drinker, but the prospect of life without cheese is not one I look forward to. My motto is that bleu cheese should go on almost everything. I think I would rather give up meat than cheese. I am also devoted to both Haaden-dazs and to my ice cream maker.
Other than hopefully feeling better, my only consolation is the tiny environmental impact I'll be making my buying less animal-based food. If there are any other milk-avoiders out there with advise for how to make the next month bearable (and I know already that vanilla-flavored soy milk on cereal is not bearable) please let me in on your tricks, secrets, and various other dairy-free coping mechanisms.