Hello minimac,
Welcome to the NeuroTalk Support Groups.
My first thoughts when reading your message straight off the bat...
apart from neck injury, it is possible that you may have dislodged some crystals in your inner ear and that has affected your balance. If the dizzy feeling has subsided with time it's possible crystals have been absorbed back into the body.
You probably know already but it is possible for a person who has anxiety to feel dizzy.
I wouldn't go spinning your head around like that again.