I know it sounds like sinus's but I was at my ENT like four days ago because of my brain tumor freak out from the dizziness (which has SUBSIDED) to say the least. But my sinus's are clear as a whistle. Like random throbbing aching pain behind my eyes above them, center of forehead etc. What can it be? Should mention the occasional flashes of light in my peripheral and up top of my vision (cieling) that flash and come and go (months now).