I would keep a journal of symptoms
and unusual behaviors prior to the appointment, and if you can, try to video
what your son is like during an outburst. Make the psychiatrist aware if you observe symptoms such as: disordered thinking, strange ideas or delusions, mood swings, periods of reduced need for sleep, extreme changes in energy level, hypersexuality and suicidal or homicidal ideas.
The very first priority is everyone's safety--yours and your son's.