I'm not sure if what I have is similar or not, but I stutter. Not constantly or anything, thank god it's fairly infrequent as I've had it much worse at points in my life, but it happens. These days my stutter is more of a block stutter, where I won't be repeating a word but will instead be silent while I try to relax enough to get past the problem syllable. If someone's looking at me I probably look pretty stupid as my mouth will be forming the word but not making sound. For me it almost always occurs at the start of a word, often when it's a vowel to begin with.
I saw a speech therapist once for it when I was a teenager, and they basically told me it wasn't that bad and that it happens because of tension. She gave me a couple of tips, one of them being to repeat the syllable x amount of times (any number I decided in my head) and then go on with the word. I don't really do that much, not sure how to apply it to my block stutter that's prevalent now anyways. What I do do sometimes however is go back to the start of the sentence to see if I can do it again. Mainly though I try to physically relax. I usually don't notice that I'm tense at all when I stutter, but I also didn't call my overwhelment of having responsibilities, anxiety, so maybe I'm not as good at reading myself as I feel I am.
I know when I'm going to stutter just before it happens.
Stuttering for me doesn't at all feel I've lost the words somewhere, I know what I want to say but I can't.
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Not autistic, I think
Prone to depression
Have celiac disease
Poor motivation