Thanks for writing yor query.
After reading your post, it seems that you have not suffered from any internal injury of the head.
can be due muscle spasm as a result of injury.
Headache and other symptoms will subside in few days to weeks time.
Proper rest will speed up the recovery.
If the pain is severe, you can take pain killer like Ibuprofen
one tablet twice a day after meals along with an antacid
You can apply locally pain relieving gel on your neck for some relief.
Avoid any physical or mental stress
. Also avoid watching television, computers and text messaging untill you feel completely normal.
If you develop any abnormal symptoms or your symptoms are persisting, you should get a scan of your head and neck done and get medical attention.
I hope this is helpful to you.