In my opinion, telling him to stop and relax could make it worse. I personally don't like it when people tell me that because if it was really that simple, I obviously wouldn't be stuttering. It's like getting unsolicited advice. But as a mom, I would say to try to find children NSA (National Stuttering Association) groups. One of my friends runs one and I would go sometimes to help her with the kids. Kids hanging out with other kids stuttering can make them feel less alone. Also going to a conference to meet thousands of other people who stutter too may help. (I never been to one but heard from other people who have.) Give him love and support. Keep encouraging him and telling him that he is smart. Also encourage him to talk (but not in a forceful way.) Treat him how you would treat anyone else. Also, it may be that you found a bad therapist? I wouldn't rule it out completely based on one experience. There are some good ones out there. Hope this helps.