:( When i was younger (11-15 or so), my stutter morphed into "blocks" like u describe. During that time, i could not even answer a phone and say "hello" - it just won't come out! It would feel as if someone shoved a sock in my throat. :( Am now 59m, and as much as that very dramatic dramatic "block" no longer happens - over the course of the day, I'll have regular blocks - i know the word i want to say... it just sits there, in my throat, waiting to be allowed by my brain/mouth to be released. :( I'll give it some time - i often pretend i am thinking/reflecting on something, but if i can't manage to get it out, I'll either change the word, or, pretend i forgot what i wanted to say (if someone was waiting on me), or just not say a thing, if it was a new conversation i was starting. It simply just sucks!