I am a fellow sufferer of non-diabetic PN. 300mg pf Pregabalin + 300mg of Oxcarbazepine helps take the edge off. Another helpful hint is doing controlled breathing in a darkened room or in bed. It helps calm the system.
Breath in deeply for count of 7 , hold it for a count of 5 and then breath out slowly. Do this multiple times until you feel the calming affect.

Lastly, I feel it very important to j=keep moving as much as you can tolerate. Otherwise, you've resigned yourself as allowing PN to rule your life.