I've recently started experiencing some seemingly involuntary head/neck movements. They are like small twitching or jerking motions. It seems to me like they may be related to a few possible causes:

Neck spasms, eye twitches or anxiety.

I've read that whiplash injuries can lead to neck spasms.

I've been doing vestibular eye exercises and I think that I may be noticing these involuntary movements the most after completing the exercises when my eyes feel a little bit "tired" or "stretched".

Another likely cause is that I've developed a kind of fear of movement. As a defense mechanism I think that I may be unconsciously stopping myself from doing some quicker head or neck movements out of a fear of reinjuring myself. This may lead to what feel like jerks or twitches as my muscles tense or stop me when I notice myself starting to move in certain ways.

It's hard for me to tell exactly what the cause is. Has anybody had a similar experience? I find it to be problematic because sometimes the movements lead to feelings of dizziness or nausea.