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

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