Im gonna tell you what worked for me. I had insane anxiety and it made my stutter insanely worse. Nothing which i tried-helped. So 2 days ago i went to the beach and just sat there for hours and i was talking to myself. I finally understood that i have to accept myself as the way i am. I asked myself- Why i am worrying so much, why am i afraid of talking to people? And then suddenly i breaked down and started to cry. I think somehow i fixed myself, because at this exact moment i felt super relaxed- just like all this negativity and anxiety just went away- my heart was beating super slowly and believe it or not… my stutter is gone and i have my self-confidence back. Life is beautiful.