Demyelinating disease: What causes it?

Stroke isn't listed as one of the causes. I wonder what the exact damage is in your white matter when deprived of oxygen.  A neurologist I saw one time spouted off that I would recover no more function because by that time(2 years) the white matter connecting to left side muscles would have dymyelinated from nonuse. One of the reasons I think neurologists have got to be some of the stupidest doctors around.
http://www.mayoclinic.org/demyelinating-disease/expert-answers/faq-20058521/?

Multiple sclerosis

Multiple sclerosis (MS) is the most common demyelinating disease of the central nervous system. In this disorder, your immune system attacks the myelin sheath or the cells that produce and maintain it.
This causes inflammation and injury to the sheath and ultimately to the nerve fibers that it surrounds and may result in multiple areas of scarring (sclerosis).

Other causes

Other types of demyelinating disease and their causes include:

• Optic neuritis — inflammation of the optic nerve in one or both eyes
• Neuromyelitis optica (Devic’s disease) — inflammation and demyelination of the central nervous system, especially of the optic nerve and spinal cord
• Transverse myelitis — inflammation of the spinal cord
• Acute disseminated encephalomyelitis — inflammation of the brain and spinal cord
• Adrenoleukodystrophy and adrenomyeloneuropathy — rare, inherited metabolic disorders

MS and other demyelinating diseases most commonly result in vision loss, muscle weakness, muscle stiffness and spasms, loss of coordination, loss of sensation, pain, and changes in bladder and bowel function.

Treatment

No cures exist for demyelinating diseases and their progression, and symptoms are different for everyone.