I know that feeling of pressure in the head. I don't feel like I have sinus problems, per se. But I often feel like my head is tight inside - and it affects my vision and hearing and how I perceive everything around me. It's not that my vision or hearing is poor; it's just different and uncomfortable. Makes me feel dizzy sometimes too, though not necessarily a classic dizziness. I'm probably not making sense. I do know that I had an allergic reaction to penicillin around the time everything was going downhill, and I'm not allergic to anything else I know of!