Thank you for your question and welcome to ADHDCentral.com.
I am sorry that you are going through such a difficult time right now.
Certainly, this behavior is something you want to discuss with your son's doctor, especially if this type of behavior is not usual for your son or started suddenly.
Additional information:
The Out Of Control Child
Creating a Discipline Process at Home
Oppositional Defiant Disorder (ODD)
ADHD and Conduct Disorder
Please let me know how things are going.
Eileen