Hi David, there are a lot of knowledgable & very caring PN sufferers right here that have to do deal with nerve damage on a daily basis, perhaps if you or your wife could give a bit more detail about her PN, eg, has a cause been found or is it idiopathic PN diagnosis ? what tests has she had done so far ? is she seeing a neuro that is a neuropathy expert ? just info like that so the members have more of an idea, which may lead to some helpfull suggestions.
Some people including myself have found some relief with certain supplements, there is a lot of info in the " Important links/ Stickies " up top of the front page of the forum.
good luck
Brian