This sure sounds like an anxiety reaction. After the fatigue of an EEG, you were ripe for any minor trigger. The worst that could have happened is some aggravation of a subtle neck injury. But, based on your description of symptoms, I believe this was an anxiety reaction. I have seen this same reaction with many others from getting a hair cut, shampoo, and similar head movements.

Try to convince yourself that this was not a trauma and you should be able to get back on track.

btw, It is very rare that an EEG is done after a concussion. They will not show anything unless you are having seizures. It makes me question the expertise of this doctor.

A very special EEG called a qEEG, can indicate some concussion issues but a neuro would rarely order one because the neurology board has taken a stand against the usefulness of qEEGs.