[MisSFiT]

You said that you get dizzy sometimes? Well, maybe you could have an inner ear infection, that causes vertigo.
Or the inner ear infection could also be caused by a sinus infection that spread and that is why you have a headache when you shake your head sometimes and thus would causes dizziness. But it your headache is/was as bad as what you say, I'm sure it's a migrane. Take Excedrine. It's full if caffene, so don't take it before you go to bed. Once you've had a migrane you are more suceptable to them from now on, so BEWARE!