[ajb]

One theory about anxiety is that there is a self reinforcing cycle:

Feel anxiety - attention on own body language - less attention on others - less effective communication - feel more anxiety

The theory then goes, that the way to break the cycle is, when you find yourself paying attention to your own body language, resolve to concentrate instead on making the communication effective. Look outward, not inward. Ask clarifying questions, find out the context, look for people who might want to ask their own question but are too nervous etc.

This creates a positive cycle. You become better at communication, and your body language improves as you stop feeling that your are at the mercy of the situation.

Other people are not actually interested in whether you are feeling nervous, they just want to communicate. They will forget fumbles if you move past them yourself.