I have migrain like headakes, pressure all over my head. Severe dizziness, when tilting my head, standing up, sitting down, laying down, and walking. I have the sensation of being thrown around in circles, as if I was on a ride at a fair that went in circles, extremely fast, or on a roller coaster, being slung around very hard and fast. At night, I am hot, then chilled, all night long. When I first lay down, it takes a few minutes for the room to stop spinning. I am tired, and feel sick to my stomach, all the time. Can you tell me what could be causing this?