I've been seeing the chiro, and i get sinus problems, and after reading Doc Sutter's forum for awhile, i realise that what you think are completely unrelated conditions can indeed be caused by a structural problem.
I get trouble top of neck along with my back and pelvic problems, and all the nerves are there that go to the brain, cortex i believe it is called, and tightness there can cause other problems, and she said it is possible that could be causing my sinus problems, although i think it is dairy related, but who knows, time will tell.