This may sound silly, but maybe you should talk to a dentist. A long time ago I worked with a woman who (from what I can remember) was experiencing all kinds of sinus and health problems. She finally went to a dentist and turned out she needed a lot of dental work. When I say she was like a different person afterward it is an understatement!
It may not be your problem at all, but at this point it can't hurt. Good luck, I hope you feel better soon.