Thanks to all for your helpful replies. I had read some of the sites, but not all. My feeling right now is that:

1. Current medical science understands little about pain, in general, at this point.
2. I think that there can be overlap of different syndromes or causes of pain, rather than everything being neat and tidy.
3. I think that I may have some peripheral neuropathy problems, but that they are greatly complicated by some sort of central component that is not understood at this point. My "PN" pain came on suddenly during a severe migraine attack (central nervous system problem). I had been sufferring severe migraines about 4 days a week for months while an incompetant jerk of a neurologist messed around doing nothing. I think that all this pain caused something to suddenly go very wrong with the central mediation of pain in my body.
4. My opinion may not be right, but it is arguably as good as anything else out there in medical land right now. I'll never find the truth in my lifetime, I don't think. but someday science will sort all this out.