pitters
A sense of impending doom or extreme apprehension.  Refers to armpit perspiration that accompanies a frightening or uneasy situation.  Used as an excalamation or a noun.
"Pitters dude!  I'm running on empty and it's a hundred miles to the next gas station."

"I've got some irreversible pitters going about this project for work.  My boss has been riding my ass all week and I haven't even started yet.