mance anxiety
"I have 20  years of public speaking experience as it's been about 75% of what it is that I do for a living.  I loved it and have always been good at it.  Over the last two years, I've developed these severe panic attacks before giving a presentation and they were progressively getting worse.  The blood would rush to my face, my heart beat would pound in my ears, my voice would shake, I couldn't control my breathing or train of thought.  This sudden inability to do what I've always done led to depression.  I finally went to see my family physician.  She immediately prescribed me propanolol.  I take 1 10mg pill 30 minutes before public speaking and I finally feel normal again.  None of the feelings I have leading up to the attack appeared."