I have RSD in right foot, (mostly under control) but now developed pain in the back of my OTHER thigh after sitting on a wooden chair for too long. THe pain is very point specific and feel like someone dragged my thigh over rough concrete. My doctor thinks the RSD spread to the thigh on the other leg....I am just not sure about this. I am also getting burning with this. It is worse sitting and laying down, and better when walking. Any thoughts?