I’m so sorry that stuttering has been this debilitating. It sounds like mine isn’t as severe as yours, but when mine flares up it can be similar. I’ve done several presentations to just a teacher or TA. I know the feeling of being scared to be called on in class or having to speak up in a group. The anxiety can ruin a whole day. I try to act confident with it whenever I can but I still low-key try to avoid uncomfortable speaking situations. It sucks. I wish I knew why I stutter.