I'm in my third year of polyneuropathy. There are many possible causes: stenosis is the most likely. Also, I was taking Amiodarone for heart arrhythmia for many years which is a very toxic drug. There is also a chance of pre-diabetic causes but I've tested out as only borderline.
I think I've tried all the various classes of drugs. I also used medical cannabis which helped but got in trouble with my pain doc for that. She and the state prefer I become addicted to opiates instead.
Currently I am taking the following meds:
Oxycontin 30mg a day
Oxycodone 20mg a day
Cymbalta 60mg a day
Neurontin 2400mg a day
Baclofen 60mg a day plus heart drugs.

I've tried Metanx, Lyrica, patches, Topiramate, et al. All did nothing. I'm very skeptical and leery of Neurontin but take it anyway. I am still in quite a bit of pain, especially in the AM and afternoons. I also have permanent atrial fib.

I can walk only a few yards until the pain takes me down. Sleep is really problematic. Shoes are a torture. Twitching, spasms, cramps plus all the other: burning, etc.
I also do acupuncture each week, adjusted my diet, take a B complex, Folic Acid and Vitamin D. Exercise of most any kind is impossible.

I am wondering if anyone has been prescribed Xanax, Ativan or Valium for PN and what the results were for your pain. Thanks for sharing. Joe