I'm losing my mind and I can't control these feelings anymore.?

So many things are happening all at once and I can't take it. This have only been going downhill for as long as I can remember. I've tried for years to be positive. I've tried countless times to pull myself back together. Things are getting out of hand now and i'm not willing to put up with it. I feel like i'm losing my mind because now I get to this extreme level of depression and then nearly instantly go out on some rage and begin hurting people around me. I can't take this and I can't focus. My mind is always changing thoughts. My heart is always fast paced, and i'm always becoming overwhelmed with little things. I'm losing my life. I quit my job, car's broke, i'm broke, being kicked out, losing my boyfriend, my friend is dead, I shot my pet in the head. I attacked my mother and father. Theres a warrant out for my arrest. I have the strangest urges just to strangle and burn living creatures. Things are just getting out of hand and I can't control myself anymore. I have my sane moments such as now but these occurrences are becoming more and more scarce. I don't know what to do with myself. Please help me and tell me what I need to do.