Our expert says:
It may be a muscle spasm caused by the type of exercise you do. The back muscles (Trapezius) attach to the back of your head ( see http://www.goworkoutmom.com/wp-content/uploads/2008/03/trapezius.png) and this may be the cause of the pain and the headache. See a physiotherapist to check if you have a trigger point in the area and to treat if necessary?
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