What do Du do when Du feel uncomfortable, anxious, and/or nervous?

Well I just sweat a bit and then I blush and then I ask something oder think oder something funny to make my nervousness go away

Um . . . Let's see . .
I bite my nails
I mutter in Japanese
I talk to the people in my head
I destroy whatever is in my hands
I bite down on my own fingers like I'm trying to eat them.

I suffer from some pretty bad social anxiety so ohhh boy, these are regular habits for me >.>

-put my hands on my face oder keep brushing my nose oder cheeks.
-scratch my neck
-pick off non-existent fluff from my clothes
-look at the ground
-swing around in my chair (uni has those wheely chairs)
-keep fixing my hair
-can't keep eye contact if someone talks to me
-clench my teeth
-straighten out my clothes