Stumbled across your article seeking more answers on my PN. I had same diagnosis and same issues. New neurologist identified bilateral L4/L5 nerve root compression on MRI that others overlooked after being diagnosed with idiopathic PN. After back surgery, required to remove the root cause, this past February, doctor says nerve grows back one foot every 300 days starting at the L4/L5 compression. Doctor elluded that nerve damage was above my ankle causing problems in feet. The nerve itch I had above the ankle was a good "marker" for where the nerve would need to regenerate itself, which will take a couple of years. Additionally, I can run my finger down the nerve along my shin and feel my nerves cascading like a waterfall downwards into my feet. I believe this coincides with exactly where the nerve damage is located. Now, I'm looking at my calcium channel blocks blood pressure meds as a help or hurt of regeneration. Ramping up on the B vitamins, fish oil and the like to help regeneration. Keep up your physical therapy to strengthen your core but don't do the exercises that cause a flare. Learned about nerve gliding/flossing but only told to do two sets at 15, you can easily overdo this where it hurts and no longer helps. Hopefully my thoughts aid in your quest for answers. It's taken me several months to get this little bit of information. Good luck ...