Sarah, I am wondering if you have RSD... the severity of your pain response, is more like them. Also your feet and legs turning purple and swelling? Also a sign of RSD.

Here is a thread from the RSD forum showing pictures. Some are mild, some severe.
http://neurotalk.psychcentral.com/thread16167.html

A metabolic PN would be affecting your hands too I would think.

And your history of back problems and arthritis, are perhaps adding to your foot issues.

RSD can be hard to diagnose. So posting over there may get you more information about this disorder. RSD and PN can co-exist in the same patient.