Hmmmmm…. You’re in quite a few meds there, and Ozcarbazepine could be the culprit. Have you told your Psychiatrist about this sudden onset of stuttering? Ozcarbazepine blocks voltage-gated sodium channels and dampens excessive neuronal firing. It could be affecting your speech motor networks, and now that you have been diagnosed with ADD/ADHD too, you’re at higher risk with this medication, especially of those other meds modulate dopamine and GABA in the brain. Best to reach out to your Physician and discuss/review your medications. They might adjust the doses or something.