Anyone else's stutter worsened as they grew into adulthood?

Anyone else's stutter worsened as they grew into adulthood? I've always had a stutter, but it wasn't that bad until I turned 17. In fact it was barely even noticeable, to the point that most of my school friends from earlier in life didn't even know I was a stutterer. Some characteristics of my stuttering: - **Stutters are only Blocks:**: My stuttering was almost entirely comprised of blocks. The few occasions I stuttered, I was good at word-substitution and such. - **No repititions**: On the rare occasion I was cornered by a stutter, I would simply block on the word (i.e. it wouldn't get out) instead of doing the repetition kind of stuttering (e.g. "b-b-b-block", which is something I never did). - **Fluent while reading:** I've always been (and still mostly am) almost 100% fluent while reading straight from a block of text. Somehow reading, even in front of an audience, doesn't trigger my stutter. Something suddenly changed around the time I turned 17/18. My stutter gradually began deteriorating around then. I'm 30 now, and the last ~3 years are the worst my stutter has ever been. Last year for the first time, I even experienced the repetition kind of stuttering, which up till then had almost never happened. This made me begin speech therapy for the first time, but it's had little positive impact outside of the clinic. Anyone else had an experience like mine? I'm baffled as to what changed in my brain. The only thing I can correlate this to is an increase in my general anxiety, which seemed to begin around the same time.