Help regarding stutter due to anxiety

Help regarding stutter due to anxiety So i actually have continuous months where i don't stutter at all, but once i start having a bad time i get severe blocks and stutter for days.. my stutter is purely anxiety based as what i believe. I don't stutter when I'm confident.. does anyone has tips how can i regain that? I started smoking and left it couple of times maybe if that alters my confidence.. can anybody help me on this?