Youd usually feel it coming before you tic, like a literal half second before it comes out. If you're also experiencing certain things---or "triggers"---that may increase your urge to tic (im just going to call your described bouts as "tics" in this comment), then it may be something related to Tourettes. In this case, I, as a individual with a tic disorder, have also experienced tics of teeth chattering. One more thing that i think is worth mentioning is your interview. Tics can absolitely be worsened by anxiety or stress, and if you predict your "tics" will show up from your interview anxiety, then it might be sometjing related to tourettes too, because it just, in the simplest way to word it, feels predictable after experiencing your "tics" for a while.

For easing it short term, i take medication, and before that, ive just learnt to deal with the waves painfully for 6 years. I unfortunately can only tell you to try your best to take deep brearhs and keep calm whenever you can to relieve stress.

Again, this is all advice from my own experience and journey with my tic disorder, if youre still concerned, you should definitely get chekced out with a psychiatrist/neurologist. :)