I have been getting severe headaches every single day.

Last year during September 2004 I got jumped and the back of my head was hit really hard to a point where I blacked out. Then about 3 months later, the most painful headaches started. I'm really scared if something is seriously wrong. Can anyone please help me? Email me at:
Mysticdreams4ever@yahoo.com if you can somewhat help me.
Thanks,
Marissa