I went quickly over the file I can really relate to one sentence where it says "after years of stuttering, your facial muscles don't work as they should". for me it is not the jaw, but the muscle at the back of the throat (not sure what it is called). I feel like this muscle freezes when I try to say a difficult letter/word and it doesn't let the air pass to produce the sound which causes the block. and after a few blocks, I feel that this muscle is tired what kind of stutter did you have? as in long blocks or repetition of letters?