How do I kill my Internal dialogue?

I can't stop thinking about harm. Alot of times when I'm thinking, whichever thought, be it road rage, being back in school, or if I was to be disrespected by a manager or such, I think of murdering them in very, very violent ways. Ripping their intestines out and forcing their family to eat it, seeing coworkers around me dying, being torn about by creatures in my mind. Same gist but for the last 2-3 years. I'm tired of this fucker in my head and sometimes I get hot flashes of anger where I feel like if it happened in the moment, somebody will lose their life.