Dude, if she has anger management issues... you can just go to court and get custody of your kid. She might try and get child support out of you for the other one, though... even though you're not the biological father you are still a major 'provider' and they can rope you in that way. ... This girl sounds like she's not the best thing for you ... and is holding you back and keeping you (and your kid) from happiness. I'd talk it over with her first and see if she wants to be reasonable about it. ... From the sound of it she won't be, but you've gotta try.
Best of luck to you. *hug*