I'm NOT a doctor. So, I can do nothing but relate my experience. But, I've seen recent ads for Sanexas treatment on local television. It is advertised as being for Peripheral Neuropathy. The conduction points are on the foot.
I had them put the electrodes on my lower back, instead. This was approved by the Nurse Practitioner at the Sanexas location. Dry Needling was also done on the same days.
It sounds like your problem is different from mine.
The Neurologist told me that it sounded like I might have a combination of peripheral neuropathy and that nerve problems from L3-4 "could be" part of the problem. The closest thing to a diagnosis is idiopathic peripheral neuropathy. In other words, they don't know what is wrong, just like your case and the cases of many of us.
It is important to note that Sanexas and needling did not help my foot drop or limb weakness. It did help the needle-like itching in my feet.
Following an approach where the patient should participate (within reason) in their treatment, I think I would ask more questions. It seems like you are on the right path. You didn't say whether your doctor was a Neurologist. Were your tests blood work that can rule out a lot of neuropathy causes? I paid for several panels, but they were inconclusive. Many docs will not even test, simply because there is usually no cure. They treat the signs and symptoms.
Have you tried massaging trouble areas to see if that helps? That may tell you a lot.
I feel your anxiety, and I'm sorry I don't have a better answer for you.
Best Wishes and Health!