Yes physiobob is right on this point. Always worth knowing exactly what you are dealing with. A CT scan or Wikipedia reference-linkMRI would reveal structurally what is happening to the spinal cord an d nerve conduction tests would give you an idea about the functioning of the nerves supplying your arm and leg.

One thing I didn't ask is this your dominant hand and how is this affecting your work? These issues are important. The importance of the loss of motor skills is an essential matter to consider in any rehabilitation.