Stutter on certain sounds and anxiety on meetings.

Stutter on certain sounds and anxiety on meetings. I stutter on 4 or 5 particular sounds.if those sounds are not required in a conversation.i can speak freely. But its hard for me speak in meetings (in office,meeting room).I feel so tensed and my mouth gets stuck when i tries to speak.it makes me feel so low and embrassing.The worst thing is ,i stutter while saying my name.