hi,Mom
In retrospect,a problem with my neck was the first indicator for me of Stage 3 toxicity, I think that's what they call it. My neck went numb on the right side. It coincided with extreme balance problems. I thought it has to be arthritic in origin. I visited Mayo Clinic and a couple of spine surgeons trying to figure a cure. They were useless. I had every test done in the world done and was told I was in great shape and that a spinal fusion would cure none of my problems. Actually I am very lucky that they talked me out of the surgery. Shortly thereafter an Alt/doc told me I must have mercury poisoning. I made the decision to have all my teeth completely restored by a biological dentist immediately.It is now 2 years past removal and I am vastly improved although it still takes me about 5 hours each morning to have a good sense of balance.

Regarding the neck problem- I think if you google something like restless neck syndrome you will learn a bunch. Mine has significantly diminished in the last 2 years, as a matter of fact my arthritic problems dropped dramatically very soon after amalgam removal.
Mercury can get stored in any organ, bone or tissue in the body I think. In our case , maybe due to previous damage or scar tissue, some got stored in our cervical vertebrae. I know in my case I had some concussions and whiplash from youthful sporting and auto incidents.

Good luck

Al