You are probably talking about the same thing I feel at times. It seems as though someone just hit by shin with a hammer, even though I am sitting still. Or, like the bones are being crushed in a vice.
It doesn't help you feel any better, but know you are not alone. One thing that appears to be true is that there are so many different ways that we can get pain, and RSD seems to find them all.
Take care.
Mike