what's my problem?

I have had problems with depression/anxiety symptoms for years, the latter being much more prevalent, though I have never been treated with medication or diagnosed with anything.
I also have major problems with anger. I am concerned because my anger feels irrational and overwhelming (much like my anxiety), and it overpowers my perception. For nearly no reason at all, I will get furious and feel deep hatred for myself and everyone around me. I usually take it out on my family and friends by screaming at them and acting like a complete nutcase. It feels unavoidable when it happens. Today I became angry, and I think I genuinely frightened my mother. I would never hurt anyone physically, but sometimes I honestly feel like I could. In the past these feelings have led me to cut/binge and purge/etc.
After an angry spell, I feel exhausted and drained. Then my mood does a 180, and I feel great/ashamed at my previous behavior/unable to understand it.
Am I just an angry person who needs to learn better coping methods (though I have tried deep breathing to calm down, it NEVER helps), or could I have some potential problems I need to look into? I am sick of being this way because it hurts me and the people who matter most to me.
I have never used this forum but hoped I might get some helpful responses.

[margypops]

For a start it may be a good idea to be checked by your Doctor to make sure you have nothing wrong Physically that can cause any of the behaviors you describe,and no doubt he will do a couple of blood tests for various aiiments . It could be you had some trauma in your life and havent dealt with it, maybe some therapy indicated here could help you.There are many good books out there to read ,you dont tell us your age and that could show some relevance , you have a handle on your self to some extent when you say 'needs to learn better coping methods " yes you are correct  and therapy could help with that.Many people go through these mood swings and get help,I am not going to reccomend medication personally  I dont believe the meds help at all, but it some cases I think there is a reason to use them on a temporary basis. Come back and let us know more and how you are doing.