im developing a stutter and i dont know why. How do i stop it?

im developing a stutter and i dont know why. How do i stop it? Hi! My name is Bec. Im 16 and im slowly developing a stutter. Its not super bad, fairly mild, it does get bad when im very tired but other than that its manageable. However, it is worse than it was a few months ago. Ive talked to my psychiatrist about any of my psych meds causing speech difficulties and none of them do. I also have anxiety and adhd so i dont know if thats causing it. My speech difficulties arent particularly distressing at the current moment but i have great anxiety about it getting worse. Its definitely not getting any better and i can see my speech deteriorating slowly but surely. Please help, im very anxious and need to know how i can treat this before it gets any worse. Any input is appreciated!