Hi Kas,
Please let us know what you find out at the doctor. I hope it goes away quickly for you, how awful not to be able to move your neck! My husband has pain in the neck and shoulders from spasticity issues, but he also had back problems that contribute to it too. Maybe you have a pinched nerve or somehow just slept wrong?? I did that a few months ago, slept wrong, couldnt move my head for a week! Hoping you feel better soon.
Kimber