Okey This is a really old post. But I experience the same thing over and over again. 2 weeks ago I did my academic english presentation and it was spectacular. I was really fluent on that presentation. But 5 days ago I did my third presentation and suddenly I started to stutter like hell. I remember that I wanted to say neighborhood but I stucked on the ''n'' sound. As you can imagine, from that point on I couldn't speak without stuttering. And I am still sad about what happened in my presentation. And I am stuttering like hell from that day. And It still didn't go away. But I know it is a temporary emotional rush that I am experiencing right now. So I have no other option but waiting it to go away.