So many questions! I hardly know where to begin. Let's say that I have been down virtually every PN road with no help in reducing pain. I suppose TENS units may help some with minor pain, but I would not hold out hope for it to help with major pain. Spinal cord stimulators have have helped a lot of people, but there are also many who have had successful trials and received no help from the permanent implant. I just finished SCRAMBLER therapy that has helped a number of people, but did nothing for me. Avoid those ads claiming to have products curing PN. There is no cure, yet. The best you can hope for is to be able to mitigate the symptoms. I wish you well on your journey.