My son is 11 and was diagnosed with tourettes syndrome when he was 6.my pediatrician also told me it was stress related and if i stopped making a big deal about it,he would stop.well,i found a professional who diagnosed him with TS.If you want to chat,email me and i will give more information..
Dear Frustrated Mom,
If your son is otherwise normal, the twitching can be the manifestation of Tourette's Syndrome, a transient tic disorder, a psychogenically-induced tic, etc. In other words, the behavior itself is no indicative of one particular condition.
The logical place to start is to have your son see a pediatric neurologist. Your description indicates that the motor and vocal tics are primarily reflections of a neurological, not psychological, condition. The only way to know is to pursue the relevant evaluations.