--this sounds like a post-infectious type of process.

Your report of fever before all this started implies that some infectious agent got you and while your body may well have fought it off, you may now be experiencing a post-infectious autoimmune molecular mimicry.

Basically, what this means is that the infectious agent has a molecular structure that is similar to some body tissue. The body mounts an immune response, and may even fight it off well, but since much of the immune response is based on molecular shape--antibodies are produced that fit and immobilize the pathogen, like a key in a lock--anything that happens to have a similar molecular configuration, including certain types of body tissues, may also be attacked and damaged or even destroyed.

This mechanism, by the way, is thought to be behind a number of autoimmune conditions--tissue types inherited whose structures are like those of certain passages starting a cascade when some environmental trigger, such as infection by such a pathogen, occurs.

It is a mechanism well documented in a number of nerve conditions such as Guillain Barre syndrome (you may have such a syndrome, or a variant) in which the nerve symptoms are preceded by an infectious "prodrome".

It is also possible that toxins from an infection have damaged tissues in the brain or nerves beyond a potential autoimmune attack. Both mechanisms could be at play.

The good news with such situations is that often one can experience at least partial, slow recovery. The younger and in better overall health one is, the better the chances of that.

One of the problems here is that issues with the central nervous system--brain and spinal cord--can be symptomatically exactly mimicked by issues with the peripheral nervous system. Make sure the neurologist you go to will examine both. Some imaging may be in order in addition to nerve testing and blood work ups.