Panic Induced Loops?

Panic Induced Loops? I struggle with repetitions. Sometimes when I'm talking and I reach a word where I face repetitions with (like B-B-B-Boy), I actually sometimes panic and as a result enter a panic induced loop of repetitions. And then I find it very hard to break out of that loop. It seems to go on - B-B-B-B-B-B-B-B-B-B-B-B-B and it doesn't move on. I didn't have this problem much when I was a kid. Repetitions and blocks were much easier to deal with then. If I reached a difficult word, I will repeat the first letter of it maybe 4 times and then say the rest of the word. But now when I enter a repetitions cycle....it triggers panic in me and that makes it difficult to break out of it. How do you deal with this problem specifically?