L'hermitte's is a shock sensation, like Laura described. I also get numbness from what my neuro described is a l'hermittes-type reaction, and that is dependant on position.

Maybe it is spasticity from the cold? I get pain (mostly in my legs) when I am exposed to cold. It's more like an ache (not like a shooting pain), and for me it always affects both sides at the same time. This was true even when most of my damage appeared to be left-sided.

It could be something else entirely that you are experiencing, not necessarily related to the MS.

Cherie