Our expert says:
It is a sympathetic nerve response and you don't have much control over it! Try using Perspirex or Driclor on these days, ask your doctor to prescribe 10 mg Inderal or Probanthine for you to take before you need to speak in front of the class ( this will hopefully reduce the symptoms)
See also http://www.medicinenet.com/hyperhidrosis/article.htm
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