Been there... done that... man. I remember losing my gord on my poor mother at the time.

Firstly... that movement is most likely vestibular related...and you get a little shake...and well...ya feel like crap... you aren't sure why...then you are anxious because you don't want it to be that way...and then will it always be this way... SOOOO.... VERY NORMAL to feel that way.

secondly... if you have had any kind of neck trauma...it is more likely to happen because you just don't have enough motor control right now...plus there is a natural delay in the ability of the muscles to kick in to control the neck from such movement.

so...what do you do... just riiiiiide this episode out... rest... drink plenty of fluids...

hang in there.