I have this. I had a lidocaine injection that made it worse. There is a chiropractor in my area who does very subtle adjustments for this. I have a baclofen and methylprednisolone prescriptions. I have gone to PT for 10 months but they only do massage. My neuro wrote a note saying I cannot bend my head back at all.

Believe it or not what helps me the most is Ben Gay, massaged in with plastic bags on my hands.