--the symptoms of Raynaud's can be easy to confuse with the symptoms of neuropathy, as they can feel very similar.

It is unusual, though for neuropathy to begin in the arms/shoulders. Noticing symptoms there first implies some sort of compressive, rather than systemic, etiology--possibly issues with the cervical spine, or compression of the brachial plexus or Thoracic Outlet Syndrome (the latter two are not well known entities, though we do have a forum here that covers these):

http://neurotalk.psychcentral.com/fo...sprune=60&f=24

I would think, if it hasn't been done already, some powerful MRI imaging of your neck, shoulders, and upper thoracic spine are indicated.