I find if around people and talking sip on a glass of water time to gather your composure, then slowly talk in a lower tone. The pitch of the voice often goes up an octave when we are stressed or upset. That is the practice part. And don't mumble, speak clearly. That should help. And just answer one question or thought. Don't try to answer everything all at once. This destresses one and tend to remove the anxiety or panic attacks. Hope this helps, blessings