Sounds insane but before paying a lot for a course. Check out dr Sarno videos and learn about TMS and how repressed emotions effect your speech. The breakthrough for me 1. Journaling everyday. How do I feel? List emotions. Why do I feel this way with this person? How does this effect my speech. 2. Find someone who stutters on your level, or slightly ahead in the journey. Discuss with each other how you feel, really let go of some deep seated feelings. Looking at it from a mind body perspective helped me better use new behaviour strategies. All the best.