You seem to be suffering from concussion
and this is quite common after a head injury
If you develop any confusion or if there is any bleeding or excessive vomiting or drowsiness
etc,then you must immediately go to ER and get MRI skull done to rule out any intracranial bleeding.
Treatment at the moment lies in adequate rest,local icing and taking anti inflammatory like ibuprofen
400 mg three times a day for 5 to 6 days.
Best of luck