Whats wrong with me, am I a psycho?

So i have really bad anger and im always irritated and ready to blow it seems. One night I got really drunk (I do often though) and almost positive I got drugged. I don't remember anything but apparently I walked in a neighbours house and threatened to kill them, ran away, fought wih people and even spit on and bit a friend. I got taken to the hospital where they had to sedate me because I kept fighting. Even though I was drugged, why would I react this way?? I'm not at all new to drugs or alcohol wtf!?