For what it's worth, aside from burning feet, pins/needles, and occasional zaps - the intermittent sensations I've experienced that my neurologist confirmed are due to SFN include:

* Sense that the skin on the ball of my feet had thickened (calluses) - although when I felt the area with my hand it clearly has not.
* A feeling in my calves as if the muscles were popping like popcorn. Not painful - just super irritating.

I'm still waiting for the Gabapentin to let me know whether the aching/stiffness in my feet and ankles is related to SFN or if it's something else. I can say that a little more than one week in, and just 2 days on 200 mg (taking it at night only) the aching and stiffness does seem to be reduced - but I will take a wait and see approach to see if it's the Gabapentin or short term coincidence.