This is pretty strange cause I did the exact same thing yesterday. It was supposed to be a news report from a conflict around the world. Had the same reaction and it was just awful having to redo it over and over again because I started stuttering at the worst times every single time. Probably did it around 30 times or something before I just said ‘fuck it’ and did the whole thing while stuttering the whole way. My stutter is usually not that bad but it was real bad that time. It was supposed to be 10 minutes long max but mine had to have been around 25 minutes or something.