I Am So ANGRY ALL THE TIME! HELP!?

I just recently stopped cutting, I'm going to a doctor about it, they are going to get my into counselling but I am always so angry and irritable all the time, and sarcastic even when I don't mean to be it just slips out like talking , if my mom or nana asks me what i'm doing and i'm watching a movie i'll say , sarcasticly , well idk i have a movie on and my eyes are at the tv screen ,what do you think I am doing? or if my mom comes in and says how are you , or how was your day , i'll say fine and then just really feel like wanting to scream at her to get out of my room. I just want her to leave me alone. and I just want to like ,,,, idk like ...... hit someone when things like that happen, WHAT'S WRONG WITH ME !?