Thanks for writing your query.
You should go to Emergency Department and get your wound dressed and examined.
is usually associated with dizziness
. It usually subsides with rest. If it persists, you should get a scan of your head done and consult a Neurophysician.
Pain in lower back of neck can be due to spasm of neck muscle due to injury. It can be relieved by pain killers, to be taken under medical supervision.
Take proper rest. It will help you recover fast.
I hope this is useful to you.