Breathing exercises can be effective in reducing anxiety. When the muscle spasms and tension were severe I found breathing exercises very helpful. Here are some videos that may help you:
Try deep breath exercises with some relaxation music in the background:
Cure for Dystonia 
Thanks for sharing!
Reblogged this on feelingtwisty and commented:
I know breathing exercises help. I need to be more consistent with mine. Great post with equally great videos.