--my first thought would have been that you sustained an injury to the brachial plexus, the "switching station" for many of the nerves that come from the cervical spine and then go to the upper chest, shoulders, and arms, which might have resulted in all sorts of abnormal sensations in the upper body. But you said at a certain point the sensations spread further--to the whole body? (Including the legs?)

The other possibility, especially if you are reporting color changes to parts of your skin, might be reflex sympathtetic dystrophy/comples regional pain syndrome (RSD/CRPS), which has been know to involve skin discoloration and can occur after injury--small afferent fibers contine to fire signals in the absence of stimuli:

http://neuromuscular.wustl.edu/senso...tml#idiopathic

We also have a forum for that condition you should visit:

http://neurotalk.psychcentral.com/forum21.html