Chin up pain

When I do chin ups on about the seventh or eighth rep I experience a great neck pain. The pain tends to be located all through my neck and with a headache. As far as I know I am doing it with good form and breathing properly. I am also not overly exerting myself as I can do more, it's just too painful.

EDIT: I also experience a slight nausea and dizziness.
 
I'm guessing it's a nerve pinch because I also now experience this with pushups and dips. Any suggestions because I can't really work out now?
 
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