I know what you mean - after being diagnosed, I began to slowly realize all the things that I do that are a bit out of place. And that they tend to show up more often when I am in an environment that causes me stress.
I actually do this strange thing where I begin to kind of gulp for air - but I tilt my head upwards, like there is an imaginary apple I am trying to get to, floating about 3 inches up and out from my mouth. I also ring my hands a good bit - and my wife gets driven crazy when I brush my feet against each other while I watch TV/movies on the couch.
But the nice thing about some of my stimming, is that my wife knows they are a sign of me getting really stressed out. For example, we had 'meet the teacher' night for my two kids - and there were a lot of people at the school. And as soon as my wife noticed me stimming, she just said "Here are the car keys. Do you want to go sit outside?" I didn't even have to answer - I just went outside and hung out by myself. And she got to stick around and talk to our kid's teachers.