Hello,
reading your first sentence made me think of thoracic outlet syndrome. {TOS}
what kind of work do you do?
desk? repetitive?
what fingers or part of the hand is involved?
any whiplash or head/ shoulder falls, sports injury??
how is your head & shoulder postures?
head forward, shoulders hunched or rolled forward?
uneven shoulders?

If any of this might fit come on over to our TOS forum-
http://neurotalk.psychcentral.com/forum24.html