janieg, thank you - I'll ask my doctor next time I'm in, to order a full vascular workup. Thanks, also, KnowNothingJon and MrsD for the links; that is very interesting. Susanne, thanks for sharing.

It feels like this has progressed so very rapidly. I am really scared. It went from just a few splinter-like finger pains in March, to tingling in April, to loss of sensation in hands and feet in May, to sunburn-like pain on arms and face, plus exaggerated cold feeling in feet in June. Now I have spiderweb-like feelings up and down my arms. I am so desperate to figure out the cause. But the blood has been pooling in my feet and hurting with the first few steps for longer than any of the neuropathy, about 18 months.

Also, the loss of sensation is in my elbows now. It's so scary how fast it's happening, and I can't figure out why.