Hi
I am sorry, I am not sure if I understand the importance of your problem. I just can relate that as a second language speaker new social anxiety problems occurred when I lived in the US. I was not in that way before. Is social anxiety something new in you or it was already there in a mild way and has increased recently?
I had some success practicing the language, imagining situation and playing I was talking, also breathing better, but I am not sure this is applicable to you.
Hope you feel better soon