Venting about my son's stutter.

Venting about my son's stutter. Today was a rough day and while doing homework (he is 8) he had a breakdown and started to cry. Kids at school are starting to notice and think he is stupid. I've posted before and loved all the advice I got. He is in speech therapy and has an i.e.p. at school. I've been looking into CBD as a treatment and was wondering if anyone has had any success with that?