Looks like you could have had a concussion
on your head and spine due to the hit on your head.
Sometimes because of the impact to the head there force dissipates to the spine also and can lead to a minor concussion to the spinal cord
The sensation that you are experiencing could be because of this. This sensation will pass off after sometime, but in case it doesn't then you should get an x ray
of your cervical spine
and consult an orthopedic.