I hit my head on the corner of the door. i got a bit of a bump and bruise after i felt dizzy and now have sinus pressure. i hit my head 8 hrs ago. should i be worried or afraid to sleep? i've eaten since and didn't puke. i do have a slight headache

Get checked !: A seemingly trivial head trauma that causes pressure symptoms is always of concern. Call your physician.

Concussion: You probably have a minor concussion. But any "head injury" however minor it may appear to you - must be checked out if you are having any symptoms. I would suggest to have this checked out. Even if its nothing at least you will sleep well.