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Hello. How long has this been going on? Have you had an MRI of the cervical spine?
and that test was negative? and the symptoms affect both arms, right?
My concern given bilateral motor and sensory symptoms would be a problem in the cervical spine where the nerves from both arms converge on their way up to the brain.
This would require an MRI of the cervical spine...to rule out bilateral nerve compression from something like arthritis in the neck, or spinal stenosis where the spinal cord actually gets crowded and/or compressed and symptoms begin to progress slowly down the arms (and sometimes the legs).
This is not normal. Depression cannot explain this.
Have they done blood tests to rule out more obvious things like diabetes, low thyroid, low B12 levels, etc?
Even those things would most likely affect the feet first, anyway.
Hand and arm issues often point to the cervical spine, especially when both sides are affected.
I would start at the University of Nottingham. They are most likely to have neurologists that are uptodate and have the best resources at their disposal. http://www.nottingham.ac.uk/SCS/Divisions/ClinicalNeurology/index.aspx I think a good occupational therapist could be very helpful to you as well.
Occupational therapists are the ones specialized in arm and hand issues, particularly when they involve strength and fine motor control.
Are you still there?