I have the same problem. I kind of have the same story, actually. I had been stuttering since I can remember, as a form of the regular stuttering (That you repeat the words, Ba-Ba-Banana). But then after a while it came as a form of these blocks. Words that, at some moments, I can't say, there is a clear block there, that makes me unable to say it. I can go with a synonym, but it's still very frustrating. Also, when I have those blocks, I pretend that I forgot the word I was looking for. For example, I said: "What's the word for it?". Pretending not no know. But it is clear in my mind what I want to say. Then, sometimes, the person I'm talking to completes it, they say the word for me. And, funny enough, when they say the word, I can magically start saying it. I think that in my brain there is like as if I cannot start a car, but as soon as someone starts the car for me, I can then drive, and don't get blocked in that moment anymore. So, I'm 21 now, and it's very frustrating living with that. So I can give you some light to what might work. A month ago I did a hypnosis treatment, 5 sessions, in where I was led by the physician to image various scenarios in where I was not stuttering, image my spirit animal , and all of that. And it worked. For a month and half, than it came back again. I was amazing to see myself speaking normally for the first time. So it was very sad when it came back again. But the good part is that now I know it works, I know this stuttering thing is all in my had, and that I can overcome it with hypnosis. So, I'm right now looking for a better hypnosis clinic, in where I hope they will do a better job with me, maybe be with a doctor with more experience, etc. I hope it helps, we are in this together. There is always help to seek and things to learn. there is a cure Good luck to both of Us!!