Ah, the cold water feeling! I know that one! I know lots of people who've felt it too. It is rsd causing it though for this one, I can't begin to explain why. I've never seen it mentioned in any research I've done all these years.

Mine happens in my left heel. It's when I step down I feel as if I've just stepped into a puddle of ice cold water. The funny part is every time this happens, I look all over the floor looking for the puddle of water I just stepped in and there's nothing there!! I realize a beat or 2 too late it's that cold water thing again. LOL So far that's the only part I've ever experienced it in.

Hugs,

Karen