my 6 year old is having issues at school. His teacher reports he throws his arms around while at his desk. the other children are now complaining. He has a fixation with coat hangers, since he was able to very young. He swings it back and forth rapidly and repetatively. He will cry and beg for a coat hanger if he doen't have one. He is very intellegent and is not aggresive. Would this be a type of sensory problem or ocd?