Hi Gerry and welcome to this forum,
Peripheral just means the outer extremities like your hands or your feet.

Motor nerves, the larger nerves are responsible for our movements

Sensory are the nerves responsible for sensation throughout the body.

Demyelinating means the loss of the myelin sheath that covers the nerve cells.

Just to add to the good advise already posted, i would definatly try to get on to a neuro the specializes in neuropathy, this way you will have a better chance of finding the cause as there are many ,many causes, on the front page of this forum and up top you will see the " Stickies " there is a lot of good info there,well worth reading, with this disease the more you know the better, there is a lot you can do to help yourself and if your not sure of anything just ask here.
good luck
Brian