Shaking is part of the flight/flight response. Sometimes, for some people, beta blockers help as they block the physical response.

I would shrug, allow my body to do whatever it felt it needed to; it's a defense and accepting it causes less resistance and might help decrease the shaking.

Remember Pogo: "We have met the enemy and he is us". http://www.igopogo.com/we_have_met.htm