Eye Pain/headaches Post Surgery

I had endoscopic sinus surgery the end of 1/06 to clear my blocked sinuses (every sinus cavity was blocked). Since then i've had occasional, although not frequent, double vision, nausea, dizziness. I've had consistent headaches and eye pain. At first I thought it was related to neck/shoulder pain i've been having as well but doing saline sinus rinses tends to irritate the headaches even more. I've tried muscle relaxants, allergy medication...All to no avail.

Post op followups to my ent (the one who performed the surgery) say that everything is fine and there's no sinus infection but I know it isn't. Am I going crazy or should I get a second opinion from another ent specialist?