This is an interesting thread.

Those of us with Peripheral Neuropathy, we get this too.

That water going down the leg... I had this as the beginning symptom of Meralgia Paresethetica. This is an entrapment of the lateral femoral nerve. I had it for years, from my C-section surgery. It progressed to terrible stabbing pain attacks. When Lidoderm patches came out I tried them, and with time the nerve settled down, so now I hardly have much problems anymore with it.

The bug sensations, I get them on my lower legs. Sometimes.
Certain foods make them worse. MSG additive for one. and also nightshade veggies (esp potatos). I also have a over sensativity to the hairs on my lower legs. If any breeze brushes them it feels like bugs. When I shave I always seem to miss a few here and there, and when those move...it is an odd sensation. In winter when my legs are covered, I don't have those feelings at all. If I sleep with the fan on, I can get these anywhere!

Another thing that can do this peripheral nerve thing is Candida. So if you have a yeast infection it might activate these sensations..itching. The byproducts of Candida release aldehydes and they affect the sensory nerve endings.

So while I don't have MS I can relate to this post. Over the years we have had PNers who post similarly.