I was like this a while back. I'm bipolar. I used to fight alot with my stepdaughter who was 6 or 7 at the time. I would get very angry with her. I would throw things, too. The final straw came when I punched a woman in a parking lot because she was mad at my driving or something. I now have an assault charge on my record.
I had to go to anger management classes for it. I don't know if that helped or not. My doctor put me on Abilify after the incident and that seemed to help with all my irritability and rage.
I also saw a therapist and she helped me how to handle things with my stepdaughter.
I think it is the bipolar.