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Hi atsguy,
I'm a teacher and occasionally it all falls apart in front of a class, especially a new class. I hear my voice going weird and feel the heartrate pick up. All I have found that helps me is to stop completely for a moment, close my eyes and take 3 - always 3 - really deep breaths. It calms the heart and gives the sane brain a chance to take charge of the panicing one. I know it must seem a bit odd but it is better than falling apart. I invite the class to join me in a 'relaxation exercise' before we start work as cover sometimes.
Hope this helps - keep smiling!
Cheers
Val :)