Hello ((( I don't matter))). I have experienced this.

I used to be very comfortable with public speaking, and one day right in the middle of a presentation, I suddenly became aware that every one was looking at me and listening to every word I was saying.

My hands began to sweat, I was short of breath and could barely speak, light headed, blood drained to my feet and I was having my first panic attack , I think.

After that, my fear of doing anything public just terrified me as I was afraid of going through that experience again. I did manage to over come it with practice, but when I allow myself to slip back into the background for any significant amount of time the fear creeps back up on me. Best wishes!!