Hi, I would suggest you could do the McGuire programme if it's available near you. It's worldwide! And once you do the four day intensive course you are a member for life. It reteaches you how to breathe using your diaphragm ..and use voluntary stammer amongst other techniques. You need to put in the effort, it's not a cure but it definitely works ive seen it. And you have support groups after and a have a community. I did it a few year back. :)