Hi there, interesting topic, I already posted some comments regarding psychedelics. If you have a lot of anxiety related to stuttering I wouldn't recommend you to try any psychedelic. When my speech started to worsen and I didn't know why (I was covert stutterer) I took some diethyltryptamine and thought that some miracle will happen and I stop stuttering or I finally get some insight into my stuttering problem. But this didn't happen :D. It only speeded up the worsening, I was much more aware of it and I was scared of stuttering. Yeah, so I finally seek out the speech therapy. So yes, technically it helped me to get my ass out and reach help :D. And yes, psychedelics can make you to look your live in a different perspective. I think I am much calmer and relaxed now, but the change didn't happen after one session but after about a year of real work.