It might be good to get some LTD or added insurance coverage before you proceed further with any diagnosis.
Plan for the future and costs of care etc.. just in case..
This is probably a good idea for anyone that doesn't have a need for urgent diagnosis..
For the symptoms you listed, since everything came back clear so far, I wonder what kind of work you might do?
A lot of desk work , previous whiplash, repetitive, or above the head work, sports injuries, weight lifting?
Did the DC or massage person check for trigger points?
Any phys therapy /evaluation with an advanced PT?
If any of those sound like they might fit check here-
http://neurotalk.psychcentral.com/post388-1.html
more-
http://neurotalk.psychcentral.com/thread84.html