(LittleForgetMeNot)) - first thing is get yourself warm - put on a sweater or blanket. Then you're going to close your eyes if you can, and start breathing nice and slow using your stomach muscles...not the upper chest. Think of something pleasurable.

It sounds like your body is having an automatic response to stress and I've experienced this when I'm upset and nervous. Breathing slow and visualizing something happy helps a great deal. I hope you feel better.