waking up dizzy?  

Sometimes I wake up feeling groggy or dizzy when I actually oversleep. It really is true that too much of a good thing can be be bad. Maybe you got lightheaded from beat beaten with a pillow or being interrupted from your REM cycle. Just a thought.

Yeah when you don't get enough sleep or don't sleep at all you can black out for a few minutes. Espically when something excited or unexpected happens to you. I have gone a night or two with no sleep and then i fall a sleep while not waiting to go to sleep.

Maybe your girlfriend hit you a bit too hard and thats why?

I will sometimes wake up with a headache but never anything like you say but then again, Ive never been awaken by being hit with a pillow or anything else for that matter except bad news but thats another story!!

Maybe you should see a doctor.

You shouldn't go without so much sleep. How long did you sleep before your girlfriend woke you up? It may be your body telling you you need to get more rest then you have been getting.

oh yes your brain shuts down and our body is confused with the change of schedule, you also have to adjust your diet. Can't just all the sudden cause you are young just change and expect no consequences.