Hi Steven. Lhermitte phenomenon is frequently encountered in MS, but can also be seen with other lesions of the cervical cord, including tumors, cervical disc herniation, postradiation myelopathy, and following trauma.
It occurs in about 10% of MS patients but is usually not the first sign.
Since you have a history of neck pain, you should ask your doc for an MRI of the cervical spine. If they can image the brain at the same time, that would provide a lot of useful information with which to make an accurate diagnosis.
Let me know what your follow up questions are.
I did not get your response. I will switch us over to Q&A which is more reliable than chat.