I havent really broken this loop and I still struggle from this under certain situations Like if I am too excited or scared. but what helps me alot is to not focus on my stutter when I am speaking and rather focus entirely on my speech, my breath and flow. I can feel my mouth as i speak and can sort of sing my way. This helps cause even if I do feel it coming i can recover from it cause I am so attentive of it that I can override it fast enough for people to not notice it too much. But this requires alot of attention and focus on my part so it is a flawed system in a way. Also just remember that no one cares about your stutter more then yourself. Don't blame it and beat yourself for it, cuz that is just pointless. I.e. short people think that being short is the reason for all their failures, and people are judging them for their height. How many of us that know short people actually do that though? It's the same thing with stuttering. therapists haven't helped me too much except one,but I mostly did it myself. Imo for me alot of it was mental inferiority and sort of a habitual thing that I am still to some extent trying to break away from by practising more and more