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Dear James,
The first thing you need to do is to see a physician about the neck pain. On occasion problems may arise from chiropractic manipulation and to miss an injury would be unfortunate. Symptoms of concern might include pain, numbness and/or weakness of the extremities. A physician can examine you and determine whether you have any bony or vascular injuries from the manipulation. If you have neither of these, it is likely muscular pain and will improve with time. At that point you may consider some mild analgesics, muscle-relaxants and perhaps some physical therapy.
Get it checked out first.
Good luck.