Anyone else have a stuttering-type similar to mine? If so, has anything in the way of supplements, therapy, or breathing techniques helped you?

Anyone else have a stuttering-type similar to mine? If so, has anything in the way of supplements, therapy, or breathing techniques helped you? 1) My stuttering is comprised entirely of blocks. None of the syllable-repeating behavior that is typically associated with stutterers. (Can it even be considered stuttering if you don't repeat syllables? In any case, it's definitely some kind of speech impediment.) 2) The blocks, for whatever reason, seem to happen mostly on vowel sounds, especially "O", "I", and "A". I'm fairly adept at using this knowledge to work around my stuttering at times. Sometimes I'm able to anticipate a block 20 seconds before it happens. Eg. the other day I was approaching the receptionist and was about to tell her "I'm here to see Jack," but I sensed the block approaching on the very first word "I'm", so I just switched it up to "Hi. Seeing Jack," which came out smoothly. One bandaid I've learned from analyzing my stutter over time is that on days when I'm feeling particularly susceptible to blocks, that I should avoid the word "I" as much as possible, and substitute out phrases like "and then" for "so then" - lots of little tricks like that to get around my strange allergy to vowels.