Always interested in what may be the best therapy as it seems I may be headed down the same road of PN pain. Often I look up things that people comment on - maybe this will save you the trouble if you wanted more info, too.

AXON Therapy
Uses magnetic pulses to stimulate peripheral nerves. It's a non-invasive, painless treatment that can help with peripheral nerve pain, such as diabetic neuropathy.

TENS
Uses electrical impulses to stimulate sensory neurons and the opiate response. It can help with a variety of pain conditions, including postoperative pain, low back pain, and osteoarthritis pain.

SCRAMBLER therapy
Is an electro-cutaneous treatment. Although people may think of it as being similar to transcutaneous electrical nerve stimulation (TENS) therapy, scrambler therapy is felt to work through a different mechanism. TENS is thought to work through the gateway theory of pain relief, whereby normal touch sensations blocks pain sensations. Scrambler therapy, on the other hand, is proposed to provide normal-self, non-pain electrical information via nerves that have been transmitting chronic pain information. Through a process termed plasticity, this is able to retrain the brain so that it does not ascribe pain to the chronic pain area.

Info from http://www.qutenza.com
QUTENZA® (capsaicin) 8% topical system is indicated in adults for the treatment of neuropathic pain associated with postherpetic neuralgia (PHN) and for neuropathic pain associated with diabetic peripheral neuropathy (DPN) of the feet.