Weird Tics - the strange stuff we do without realizing it

I make a lot of weird humming noises to myself when I am alone (or at least think I'm alone), I think more because I like the vibration of making noises than for the actual sound
Also to get myself to stop clenching my teeth

it gets worse when I am ill I have this completely unfounded belief that if I hum at the right frequency it will settle my stomach