Hi Woody, that's a hard question to answer because it depends on the culprit that is causing the nerve destruction, some cases can be aggressive and others may slowly get worse over time, but a lot can depend if the cause can be found or not.
Some causes that can be easily indentified through blood tests like vitamin defiencies, excess B6, insulin resistance & some medications can also cause nerve damage, cases like this can improve [ over time] once the cause is taken away, the peripheral nerves can regenerate if they are in the right enviroment, but it is a slow process, mine was caused by insulin resistance and now 5 years later on, it has 99 % gone and i take no medications for pain these days, thank god.
I didn't see any cause/s were mentioned in your post, I personally think it is paramount to have a neuro that is really experienced in neuropathy working for you [in my experience a lot of neuro's are not, in fact, some were really hopeless] but anyway then you will have much more of a chance of hopefully finding the culprit, but keep in mind that sometimes even with the most extensive workup's the cause isn't always found, unfortunatly.
I wish you well,
Aussie
