Sorry to her that. Only advice I can give is to let go. Although it’s less than desirable outcome, Once you start letting go of things, it will slowly loosen its grip over you. Remember what you resist, persists. If you keep on kicking yourself, next time when you’re out in the similar situation, you’ll start anticipating your turn to speak and dreading it….. and having full blown panic attack. I always block on my name, and had this exact same issue when introducing myself. After going through crisis for a long time, I finally said f$&@ this, and actually voluntarily stuttered on my name in front of my whole company as well. I even held the stutter for a bit longer than comfortable. From what I can tell nobody batted an eye, nobody told me that I was stupid. That speech actually went very well because I stopped thinking about hiding my stutter, and actually deliver my message. Hope this helps