hi gabby,
after my l4/5 fusion, the bottoms of my feet were horribly painful. I would tell my hubs that i needed sponges for my feet.
Like you, it went away after i got moving.

It doesn't happen so much any more. But the docs never really had a good answer as to why it happened. The neuro didn't think it was anything with the fusion.

Sorry i am not much help, but i will be looking at this thread to see if we both can find an answer.

sims