Stagger,
Several years ago I went to the "Dellon Institute" for evaluation of my sensory neuropathy. After a days worth of tests and discussions they determined that their surgery would not help me since my PN was not casued by a neurological impingement. As Bob noted the procedure may give relief to diabetics who suffer from nerve entrapment or perhaps patients with carpal tunnel syndrome but otherwise it is not generally applicable to the myriad of other causes for PN.
A comment re: your experience w/ amitriptyline, it might be worth asking your doc to try a brief course of nortriptyline, the metabolite of amitriptyline - it's known to have fewer anticholinergic side effects yet it is equally effective. That was my experience BUT everyone's physiology is different so one can not predict the effects of drugs from one person to another with complete reliability.
Good luck.
Alkymst