Cool! Stick with Fluoxetine for at least two months and see how you go. Yes, in my younger, partying years I did MDMA and I was 100% fluent. The seratonin surge essentially dampens (or quietens) the dopaminergic system, lowers inhibition and self monitoring. Not a single stutter! Once you come down though, the stuttering comes back more aggressively for a few days until neurotransmitters stabilise to baseline levels. I don’t think the issue is too much dopamine. I think it’s more dysregulation/hyperactivity which causes inconsistent firing in the speech motor networks, which normally requires precise coordination to generate fluent speech.