Suggest Treatment For Conversion Defence Mechanism

What exactly is a conversion a defense mechanism. I have an extreme social anxiety disorder which I would gladly suffer in silence to avoid people knowing something was really wrong, but I also make grunting noises and speak out loud without being aware I'm doing it. It is getting worse and impacting my daily life. I found an old blog where someone had similar experience and someone said it was conversion defense mechanism but no further details listed. If you could point my in the right direction for further details. Thank you.