I can't remember getting it on my lip.....but I get the exact feeling that you're describing in other areas....e.g. neck, cheek, eye, thumb.....etc. Can't provide any help I'm afraid....but just thought I'd jump in to tell you I know what you mean!
Neuro says he'd "bet on me having MS"
IF YOU CAN'T SEE THE LIGHT AT THE END OF THE TUNNEL...
GO DOWN AND LIGHT THE BLOODY THING!!!