Is it normal to get this angry?

So when I was young I was so happy. Nothing could go wrong, I never got mad like I do now. Now everything is wrong. The first time I noticed something was wrong was in my first year of middle school. At first I would get this boiling anger when I had to do chores. But then it blew out of porpotion and I couldn't help myself from throwing things, breaking things, yelling at the top of my lungs, hitting people, ect. Just because my mom asked me to do the dishes. At first everybody said it was just hormones. But then the doctor said basically that normal hormones wouldn't make me lash out like a drunk man talking about politics. So then I got a therapist because of the anger and I had started cutting myself. I started cutting because I knew that if I did that, I was the only one getting hurt. But anyway a couple months of therapy and I was sort of handling the anger. I got medicine and everything. Then a little longer into it, that became my problem, because she made things out to be what they weren't, and she was taking up alot of my school time, which was stressful. So anyway. Now its been like forever and now my medicine doesn't work. I even had to walk out of class one time. We had just gotten a new seating chart, and I was put next to the only person in the world that could make me madder than a llama who had someone turn their backs to them. Let's call him J. So J knew I couldn't stand his very existence. (And I'm not even exagerating, I can't stand his face, eyes, hair, clothes, the way he walks, breaths, talks, looks, his presence, his existence.)He was talking to the air about aimless things, and I had asked him a great amount of times to stop and he just wouldn't, so then he just kept at things he knew would make me mad. So I got up and walked out the classroom and went and stood out in the hall. (All breathing in deeply gets you is very dizzy.) I had to go to the nurse for an hour, after I had bit through my lip, torn up massive amounts of paper, and yelled at all my friends and almosted cussed a teacher out. So yeah, is in normal to get this angry about aimless, stupid things? What should I do, it's not like I can stop the anger from boiling up inside of my and eventully come pouring out of my body. Help.