Anxiety when speaking

I've ony enocountered one other person with this issue, and no one with any idea on how to solve it. When speaking, I will become overwhelmed with anxiety so that my voice breaks and if I continue I may be reduced momentarily to tears. This can happen even when speaking to someone I'm normally comfortable with, and it's horribly embarrassing because they then think I'm overly emotional about the subject matter. When I can, I try to disguise it as excitement or laughter, but those are not always appropriate, so not always useful.

My work with snakes is creating increasing demands for me to do public education and to deal with law enforcement officials who stop to check on my suspicious behavior (rescue work calls for slow driving, abrupt stops or swerves, scrambling up roadcuts or into ditches in the dark).

I'm wondering whether anyone else here has this issue and has found a solution.