I need help. bipolar disorder/ depression

Sorry for the vague title. First off I want to go to the doctor but need to know how to go about this. I don't even know what kinda doctor to go to or where. Please help me!

I'm chemically unbalanced badly! I thought at first it was just Depression but I have had symptoms that sound very like bipolar disorder. My mom has a type of it for one. I grew up with her and I'm seeing Alot of her problems in me. Don't get me wrong I love her to death but as a kid I was never stable because of her mood swings. It's caused relationship issues and I don't want that for my future family!
I am female, 21, and live 3k miles away from my family. I moved out to Ca w my bf 9 months ago (I'm not prego) and I JUST like today started a job! So thats why I thought I was just depressed.

Well things are getting worse. I'll be fine for a week then out of the blue BAM. I'm in bed thinking everyone hates me and I majorly F'D up or that I'm just a loser-etc. It makes us fight, makes me cry and I literally DON'T want to but it won't go away!! I can't control it. I can think about it but just can't get myself out of the mood! I got so angry with myself that I punched myself to stop but it is only getting worse.
I dont want to be this way! I've never been like this before so often. ( I do remember having a couple handful situations like this but it was when I was 4-8 when my mom and dad and Granma where fighting to keep me. So I've been to 13 elementary schools :/

If this doesn't stop I'm going to loose everything. I want and need help. I'm fine now I just have a horrible headache and very upset of what my bf had to go through yesterday.
(also I threw up out of pure anxiety)