Public speaking and presenting to groups has always sent my SA through the roof. I believe that this is the worst thing that a person suffering from social phobia can experience. Just when I think my life is going ok, something like this comes to destroy any security and peace of mind I thought I had.
In such a situation my physical signs are extreme (i.e. blushing, tightness in my throat, unsteady voice, shaking, shortness of breath, pounding chest and a general sick feeling) these are very obvious to people I am sure. Knowing that my symptoms are very visible only makes the physical signs worse, and so on ...The snowball effect.
I have suffered with SA all my life and have had my share of public speaking nightmares. I will think obsessively about an upcoming presentation weeks in advance. Generally, only thinking of ways to escape. (I.e. fake sick, quit my job, quit school,).
Anyway, I did have a point here. I am required to go for training on occasion to update my skills at work. It's either that or I work at McDonalds. This is a mandatory part of my job. There is no way around it. The classroom consists of about 20-25 people from around North America. My problem begins right away with introductions. Each person must take a turn as they go around the room and you must introduce yourself to the group and tell a little about yourself (about 5 min worth)... At this point, I am weak with fear. I start out ok for the first 20 seconds, then as I am unable to breathe properly and my heart is thumping, my voice starts shaking and it goes downhill from there. At the end of it all, no one says anything, but I get some pretty strange looks. I am now the outcast of the group and since the class is 1 week long, it's tough.
My way of decreasing the physical symptoms is vigorous exercise, such as running, just before the event. For some reason exercise seems to deplete whatever it is that causes my symptoms. This only works for me if I exercise for at least 20 minutes and no more than 2 hours before the presentation. This really does work! I am still scared beyond belief, but my physical symptoms have diminished and because of this I avoid the "snowball effect" I mentioned.
Best of luck! You can get through this.
Tim