O.Q.
Hi there.
You should also get him tested for Tourettes Syndrome. I have it mildly and it runs in families (genetic). One of the indications is involuntary vocal ticks. My brother has OCD, ADD AND TOURETTES (all all the peak of very worst). He is 30 now but I remember all to well the hell his life was in. He was diagnosed as a teenager. He refuses to take his medication and self medicates w/alcohol. I worry about him constantly. On the good side of this is that most who are diagnosed are usually EXTREMELY creative and are geniuses at the medium they choose. My brother can draw ANYTHING..freehand, from his own imagination..perfectly.
I would also suggest you introduce your son to the arts, whether it be music, dance, painting/drawing, acting..anything that will stimulate his creativity..I know first hand not only from watching my brother but also my being an actress..the arts breeds creativity and give us a sense of peace, clarity and is the place we feel most at home.
Hope all goes well..not to worry he will be fine...