If you want to take your child out of the school, write a letter to the superintendent saying you are "homeschooling" him. They can't TOUCH you then. I'm not suggesting homeschooling although the label will at least give you time to sort things out.
Better to see a real psychiatrist also because if he does have any type of mental illness then the school has to provide accomodations.
Psychologists are not allowed to prescribe or recommend meds, though. I'd go to the media.