Sometimes I go into full stutter mode. I stutter on s, f, ch, sh. I even get the facial tics that go with it. It'll be when I'm tired or stressed. I can control it to a degree by being super slow when I talk, or even pausing to wait out the stutter as it were.
I've taught my family not to help me unless I give them a signal. There is nothing worse than people giving you the word you are stuttering on. It feels like an incomplete sneeze. Sometimes I can come up with an alternate word and I'm okay with that.
God, being me is a trial...LOL
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Meddle not in the affairs of dragons, for you are crunchy and taste good with ketchup.