I think that Jo is correct; customary x-rays (flexion and extension), MRI or CT scan should enable a radiologist to discern whether there is arthritis affecting the C-spine. It would most likely be cited as DDD (Degenerative Disc Disease), DJD (Degenerative Joint Disease), or osteophytes (bone spurs) within the clinical findings or impressions.

Occipital neuralgia and other neuralgia(s) - don't know the plural for it all - are usually secondary to something going on within the C-spine. Thus, unrelenting headaches.

There was no medication that I was Rx'd that quelled the headaches; it was thanks to having my nerves nuked via radiofrequency that liberated me from awful headaches.