Originally Posted by kreink

I would see a new neurologist. If sitting is a contributing factor, you might try putting a foot rest under your desk to elevate the backs of your legs off the chair seat so you are not putting to much pressure on the back of your legs. They also make seat cushions that are wedge shaped so that your seat doesnt cut off circulation or pinch nerves as you sit. You might try one of those. I have a foot rest, lumbar support and wedge cusion on my desk chair at work, its pretty comfy.
Also try to avoid crossing your legs. Honestly though, if the pain is that bad and your doc doesnt know what to do, get a new neuro or get a second opinion.