My 9yo son with ADHD has had similar issues with defiance and oppositional behaviors. He’s been taking 27mg of Concetta for a year now and has been taking a daily dose of Barleans Omega 3 supplement, both of which have helped his emotional swings stabilize significantly. Highly recommend Dr Barkley’s “Your Defiant Child” and also Kirk Martin (celebratecalm.com) has a great program that addresses defiance and oppositional behavior. Mindfulness and short meditation have also helped give my son more tools fo self-managing his frustrations. Remember, you know your kid best-keep trying by things until you find something that works for your child and your family!