Mine has not been officially diagnosed as a circulation problem, but I've suspected it could be. My right side is always worse than my left, and the muscle spasms and cramping seem to favor my right leg/foot/toes.
Yes--it is like walking on rocks! And I had an embarrassing incident in Wal-Mart a few years ago, when I was shopping and suddenly my toes cramped in my right foot--and wouldn't go back to where they belonged. I found a place to sit and kept rubbing them. A man nearby looked at me like I was a martian! 
I finally had to get a store associate to page my hubby and kids because I couldn't walk without my toes bending out of shape, and wow--did it hurt! How weird was that??
I suspect it's all related. Incidentally, this was before I started taking any magnesium supplements of any kind. Those seemed to help me. (Check with your doc, of course, if you consider doing that).
I should mention, though, that I also have an (as yet) undiagnosed neuro condition the neurologist 'knows' is there, but can't clearly identify, so it may be from that, too, and not so much from the fibro(?) Mine may possibly be a mild form of cerebral palsy, but that's only the neurologist's guess.
It's always worse in the Fall when the weather cools--went just crazy last Fall! Then it settles down and goes up and down all winter. When the weather warms again, my whole body settles down and I seldom get any muscle cramping or spasms. Fussy body, eh??!
I have heated "slippers" (full of those bean things) that I microwave, or I sometimes use a heating pad to put my feet on. Other times I soak them in warm epsom salts water (there is a scented kind Wal-Mart has that's minty). And I make sure I keep my feet very warm at all times--even wear loose socks to bed, and I wear wool socks in the winter.
Hope this helps a bit. Not fun, I know. Best wishes! 