Hi Monica & welcome to the forum,
The Neuro saying " probably vasculitis " is not a neuro i would want to treat me, they should be looking for the cause, you need a neuro that specializes in PN.
There is a lot of tests that a PN expert can do to try to find the cause - http://www.lizajane.org/

There is a lot you can do to help your self.
Also this site about b12, which helps to heal damaged nerves;
http://roseannster.googlepages.com/home

Also check out Wings 42 " A program to heal nerve damage and reduce PN symptoms " http://neurotalk.psychcentral.com/sh...p?t=177&page=2

With medications, its a bit of a trial and see, sorta thing, what may help one doesn't necessarily help another, but there are plenty of meds out there they may help you, i think its wise to ask the doctor if they have any sample packs they get from the pharmaceutical companies, before you go and buy them and then you may find out they might not be suitable for you.
I don't no much about hyperbaric oxygen therapy? maybe someone else here can help you with that.
There is a lot of kind, caring, and very knowledgeable members here that do understand exactly what you are going through and i am sure they will be along shortly to try to help you.
Good luck,
Brian