Hey, I'm not sure if you have heard of the McGuire programme, but the creator David McGuire has a book. The book is called Beyond Stammering and basically outlines the technique that the course teaches. I attended the course and the book sums it up pretty well. Whilst it won't necessarily make you fluent, it can certainly help especially when it comes to breathing. You can get it for around £10 on the Kindle Store. Good luck!