I used to throw up and faint as a youngster, when having to do talks. Was unable to call people on the phone for years. Anxiety is a bitch.

However, the only way out is through. I confidently speak in front of 100’s regularly. I can pick up the damn phone (still a twinge of anxiety, but nothing like it was). The cure that works just seems to be “do it until it’s mundane”.

As an aside, it’s vital from the career perspective. You can’t let fear, no matter how extreme it feels, stop you. It’s a terrible cliche, but still true “no courage without fear”.