Our expert says:
Have you seen an orthopedic surgeon for this? It could be that the disc between the vertebrae disintegrated and is causing pressure on the nerve to the arm. They may need to do a fusion of the vertebrae to stabilize the area? Your headaches could be due to trigger points in the muscles of the neck and shoulders caused by spasm of the neck (due to the old injury). See if you can find a physiotherapist in your area that is experienced in "dry needling" to examine the muscles and to treat you if this is the case.
Hope this helped somewhat?
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