Hi @Stevo,
The symptoms are indeed what someone with Social Anxiety would experience when they are faced with a situation that is out of their comfort zone.
Thankfully I have left Social Anxiety in the past and there are many ways to help heal it, hypnotherapy is one way that can help.
Just to give you some clarity on what would have happened. Basically, when you're faced with a situation out of your comfort zone, you will have an outcome in mind..
"I hope this goes well." "I hope people find what I am saying interesting."
The problem is that if you haven't done this before, your ability to guarantee these outcomes will be limited by your skill level in that area.
If you have low skill in this area (which if it's a new thing and out of your comfort zone is likely) and the outcome you have in mind is out of your control, you will experience anxiety.
One solution is to get better at achieving your desired outcome with practice or to instantly have an affect, change your focus to an outcome that is within your control.
Something like, "I am simply going to deliver the material I have." Which this focus you can guarantee that you can do that, and any anxiety will be greatly reduced.
My blog covers many aspects of healing social anxiety, so check it out if it's something you would like to understand more.