It does sound, though, as if some other areas should be explored to determine what exactly is causing this. From what you've written, the symptoms could be coming from the spine problems--is there any cord compression? You do mention radiculopathy of the legs--that implies there is some pressure on the nerve roots at some level of the lumbar and/or sacral spine; do any of your imaging reports mention foraminal narrowing or impingment at any levels there? (The foramen are the spaces through which nerve roots pass through as they exit/enter the cord--"radic" is root in Latin.)

And, to examine another possibility, plenty of anti-cancer agents are neurotoxic.

Moreover, you may have an ongoing post-herpetic neuralgia with all those herpes zoster attacks, and those tend to occur within dermatomal distributions similar to radiculopathies.

Is suspect your neuropathy may be multifactoral, with one contibuting factor superimposed on another--and only really detailed analysis and testing might tease out these factors. With motor symptoms, first thing I'd really look at is the spine, though--do you have any recent imaging reports you could share?