Hi Holly,
When I get them what I do is, okay.. this is odd: I mouthed the vowel sounds, A ,E, I, O, U. I do them very big and drastically, mouth wide open, to stretch the muscles in my whole face. I seems to relax them afterward.

I do this ten times in a row and I am good to go. Open the mouth wide, shaped like the sound of each vowel. You don't have to say them, just mouth them and say them in your head.

Do it in private, it looks as odd as it sounds. It works for me, but we all are different, so it may help some here, and you too. I hope it works for you. I used to get embarrassed at work, I would think everyone was staring at those twitches, eyes and mouth. I wanted to hide out.