I actually became enraged over this last summer. It seemed to happen because of something trivial but really it stemmed from insight gained from psychotherapy. Sometimes facing the truth can make us very angry. I stayed angry the whole summer and it ended with a bipolar, mixed episode that included SI and me attempting to hang myself.
Anger is very serious stuff. I've never been as angry and enraged as I was over the Sumer. I could actually feel the rage coursing through my veins. It was horrid. My anger has largely subsided but I think it's because I finally decided to make some serious changes in my life. Now I focus my energy on making myself happier by actually considering what I truly want when I make decisions. I learned I have to pay attention to what I want and not what the people I love want or expect. I believe that in the long run, my loved ones will appreciate my new direction because it will truly make me happier.
I hope your anger has passed and that you've figured out its true origin and what you can do to change things. We are all works in progress so try not to be too hard on yourself because it's really just your subconscious trying to teach you more about yourself. In the meantime, just know that it will pass eventually and you are not alone.