Liz, i would ring around as Aussie said and try to get opinion's of the best person to see for your problem, it's not going to be easy but very well worth it if you can nail down a good neuro who is experienced in PN.
Then get a refferal off your GP to see them in their own private consulting rooms, if you went through the hospital system it may take a couple of years to get in to see them the way our health system works these days and you could very possibly end up seeing one of the neuro's students, there is no way i would go down that track.
good luck
Brian