Concussion - is it a possibility?

[jedi1010]

Hey,
I'm 20 years old and healthy. I hit my head on a dent in the celling 2 weeks ago and it hurt but i didn't think much of it, only to have a killer headache/almost passing out episode 3 days later.
-I've been nausous since, went to the hospital a bunch of times and was diagnosed with a concussion. They did a CT scan and everything seems normal. Same with neurological test (Where they ask you those weird questions)
I'm worried that later on i'm going to have iternal bleeding randomly, or some kind of swelling that will permantly affect me. Will this go away soon by itself or do I have to worry about a random bleed or episode that could be life threatening? Ive never had a concussion before.
Also is the pressure i feel in my head normal? Its affecting my nose, forehead and ears...I feel like i kumped into a pool of water and it went up in my ear