My son does this. When you tell him to quiet down, he's very confused, so I don't think he even notices it.

My son screeches too. When he is excited he will talk super fast and not take a breath in between his words. By the time he gets to the end of his thought you can barley hear him because he has no breath to continue speaking.

Sue i do that all the time yes my son talks loud the school has worked on inside out side voice

Autism adhd odd ocd. he takes adderal and depacote. they work great hes happy

adderal helped to i said i would never use medication but hes not drug or out of it he more focused and calm