Thank you for your query.
The behaviour being shown by your son is not due to any illness but is a problem of adolescence. At this age children tend to revolt and even act bizarrely. This needs to be handled gently but firmly and it is better to take the help of the school psychologist
and teachers. Sending him to a boarding school or institution is not the solution.
I hope I have answered your query to your satisfaction.
Wishing your son an early recovery.