I've been through a lot of therapy and nothing helped until I found a therapist who really understand the issue of stuttering and what I needed. Good therapy can make a world of difference, but it can also be hard to find. Try to keep looking to find someone you believe in. Other than that, it was figuring out the problem was not stuttering but me believing stuttering is a problem. I worked to remove all the extra crap and work on getting comfortable in my shame, which will slowly lessen it, and take baby steps to letting myself stutter as my body naturally would. To not fight it, but take it as a unjudged part of me and realize it's OK to stutter. That's the long and short of it. People don't want to stutter and that's what's making their stutter so painful. If you just let yourself do it, it won't be painful because the nature is stuttering is only disfluency, not all the extra baggage we add on top.