First and foremost, I'm not a physician! However, you sound close to what I went through for a year...a monster sinus infection with no ******d symptoms (runny nose, etc.) until I became nauseous. I was actually having bad post-nasal drip without realizing it. I had had sinus surgery two months, and a year, prior...and took antibiotics...and still developed an infection. By the end of the first year.....I was a basket case, along with horrible migraines, and all the other symptoms you listed! When I realized what was wrong (and yes, I was under a general practitioner's care who prescribed the Zomig for the migraines), I immediately got an appointment with the surgeon,to confirm my suspicions, to which he concurred (after a CAT scan of my sinuses), and received mega-doses of Levaquin for a full month (sinus infections are notoriously difficult to clear). Since then my migraines and all the other weird symptoms have slowly subsided. It does take a while to clear up.....no miracle cure there!
Bottom line........see your physician....and if he doesn't resolve your problem, perhaps a trip to a good EENT specialist (eye, ear, nose, throat) should be in order!
Good luck and keep us posted!!!!