What Causes Cold With Dizziness,headaches And Nausea?

Okay I'v had a runny nose, feeling light headed, and when it's totally cold in the room i'm hot as can be and sweating. When I wake up in the mornings all I see is black once I stand up for like a min. or 2. I'v been having the worst migraines or headaches. I get light headed all the time. SOmetimes I even get nauseated. What's wrong with me?