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I have a handful of patients each year with a severe neck disorder that causes dizziness, difficulty in concentration, hypersensitivity to sound and/or light and extreme pain to touch in the upper neck.  I believe this is caused by compression of a nerve ganglion at the top of your neck.  Listen to a patient who had it and read this article or send it to a friend.  It may change your life.

http://www.spinalstenosisanddisc.com/articles/2-articles/66-neck-pain-headache-nausea-blocked-ears-sensitivity-to-light.html