Thanks for you query.
The symptoms you have mentioned suggest that you had concussion
due to the head injury
There is no structural damage in the brain , only some biochemical changes occur which result in development of any of the following symptoms:-
1. Episode of loss of consciossness
4. Seeing flashing lights
5. Persistent headache
6. Difficulty in balancing the body
7. Episode of seizure
8. Irritability or confusion.
But don't worry. It can be healed by complete rest- both physical and cognitive- no television, no text messaging, etc
It is advisable that get your head scanned and consult a Neurophysican.
I hope I am able to answer your query. I you have furthur doubts, please let me know.