There are really over 100 causes of neuropathy....all different.

Mostly PN affects afferent nerves.... those going from the peripheral parts of the body back to the brain...

http://faculty.washington.edu/chudler/cv.html
This link explains the 4 main types of afferent fibers.

Efferent nerves go from the brain down the spinal cord, and then
mostly innervate muscles.

This link is about efferent nerves (mostly motor)..
http://faculty.washington.edu/chudler/cells.html

It helps to understand how the body works, and these two links are pretty easy to get the idea.

There are also inhibitory nerves, which prevent other nerves from firing. These use GABA as a rule. (this is not gabapentin).
When these fail, then control of motor functions escapes and there can be seizures or dystonia, or myoclonus etc.

This article explains how Benzodiazepines control myoclonus, but not long term.
http://www.ncbi.nlm.nih.gov/pubmed/2165012

If your myoclonus is getting worse...and you are on a Benzo drug... Klonopin or Valium, this may be due to tolerance issues to them. These drugs work well in the short term, but not in the long term, as tolerance develops and people need higher and higher doses.