@sheredwrds I am also a cervical spine surgery patient, but mine was a fusion. The facet joints can also click and can be affected by arthritis when they get too much pressure on them. These are the joints that allow the spine to rotate. Are you able to reproduce the click with movement or is it random. Has your doctor herd the click?

The migraines you are experiencing may be related to muscle spasms in your neck. If some vertebrae are getting independently rotated by a spasm, it stretches muscles that complain, and it causes muscular headaches similar to migraines. You may wish to consult a physical therapist who can figure out if this is happening. My PT also does myofascial release which has been very beneficial for fixing this problem for me. Here is our discussion on MFR and you can find a provider search at http://mfrtherapists.com/

-Myofascial Release Therapy (MFR) for treating compression and pain: https://connect.mayoclinic.org/discussion/myofascial-release-therapy-mfr-for-treating-compression-and-pain/

Have you heard of myofascial release before?