I'm so sorry you feel this way. I have had days like this, admittedly my stutter is very sporadic, can go full sentences completely fine, others not. I just own it, after I stutter out the sentence I say "man my stutter is bad today, don't know why...probably tired" or something and that eases the tension, and I've learned to take that time to be anti-anxious and it seems to help me in the moment. Also know that people observing you feel for you and know you can't help it. It's funny to me that some say "Oh I didn't even notice" when it was super obvious that they HAD to notice. People show that they care by being silent and not asking.