Hi there and thanks so much for posting this question at the forum. Feel free to post at the Neurology or Migraines forum as well
You are doing the right thing by expressing concern and seek for professional advice.
Unfortunately the latest news we are hearing about concussions and brain functioning are not good. Right now they are associating the death of a famous pro football player who committed suicide with brain concussions he suffered when playing.
Whenever there is a concussion there is an internal shake up in the brain around the meninges and the skull. Our brains are designed to take a lot of hitting and bumps but to tell you the truth if you have seen clear signals I would go to a neurologist and get check that there is not an internal bleeding or similar. Sometimes in concussions you need to watch for the after effects. Do you remember the case of Liam Nelson wife (Natasha Richardson) who was skiing she felt on the side got home and 2 hours after she passed away cause of severe internal bleeding. That is not your case at all but clearly if you felt something in the motor and coordination areas it is just cause the internal shock. Probably is just a concussion and it will go away.
I bumped my head few days ago and felt light headed but then went away.
My obligation it is to really recommend you to get a neurologist and check for internal bleeding or similar but i can guarantee that there is less than 1% that you have that or even that you are going to have consequences in the future but to be safe just check.
According to an article from the New York Times
“Contrary to popular belief, a concussion is not a bruise to the brain caused by hitting a hard surface. Indeed, no physical swelling or bleeding is usually seen on radiological scans. The injury generally occurs when the head either accelerates rapidly and then is stopped, or is spun rapidly.
This violent shaking To read more click copy and paste here http://topics.nytimes.com/top/reference/timestopics/subjects/f/football/head_injuries/index.html
I hope this helps and I am sure it will be nothing....