I chew on the inside of my lip/cheek (that one is a really bad habit... I'm doing it as I type!), crack my knuckles, run my fingernail under my other nails (if that makes sense?), and I go through stages of having to "fix" my nose ring often.
"And death is at your doorstep
And it will steal your innocence
But it will not steal your substance
But you are not alone in this"
“My ability to turn good news into anxiety is rivaled only by my ability to turn anxiety into chin acne.” - Tina Fey