I have a tbi and too suffered from emotional outbursts. They seemed to be out of my control. I would try not to have them but it seemed impossible. There is a tremendous amount of frustration when it feels like your whole life has been taken away from you and for me it truly was. I share your challenge of living with a disabled adult and caring for them. Although he has a different diagnosis the behavior is the same. Because he cannot control himself I have had to establish safe zones for myself . I have a lock on my bedroom which really helps. He can be destructive and steal my things etc. I have found I also have to leave. Yesterday I had to leave for 6 hours. While it is not intention the behavior is abusive. Without boundaries I ithad triggered former PTSD. So take care of yourself. I need to remind myself it usually has nothing to do with me but he will accuse me a lot for causing his outbursts. I am with you on this and know you are not alone
Sue