Oh how familiar THAT sensation is. I can't put my phone on vibrate and stick it in my back pocket. Can't tell the difference between my butt vibrating and the phone ringing!

When I first had it, I described it to my neuro as "the feeling you get when a cat sits on you and purrs." I get it in different areas of my body. The weirdest was when the tip of my tongue was doing it.

<sigh> Gotta love this disease!