Hi YaledMot
Welcome to Neurotalk. There's lots of useful info on the site regarding neuropathy and it's various form and causes.
As you've already found out it can be a complex issue with more than 100 different types and just as many causes. As regards prognosis - everyone's different depending on cause and type - not what you want to hear I realize. Idiopathic is a label that makes it harder to figure out what's happening - trying to figure out a definite cause is the best way to optimize treatment (different causes and types are treated differently)
If you have the energy you may want to search the site for 'axonal neuropathy' to narrow down topics (I've found that the word polyneuropathy is quite a generic term in the medical sense). Also you may want to try browsing some of the older threads for info about how others manage. Here's a link to get you started:
Neuropathy does improve
This is also a good site for general neuropathy information:
Peripheral Neuropathy Fact Sheet
Please ask if there's anything else specific we can help with - I have several different websites bookmarked that I'd be happy to share.