Jesus Christ...those attitude swings are so painfully familiar, flipping from being your friend to hating you or blaming you. I'm a kid wih a BP mom as well. The suicidal ideation and threats were never that bad (and mostly just talking), but similarly random seeming.

Moving out really is your best option, if you have the means.

If your mom's like mine, she'll try to stay attached through phone calls - do what you can to set limits or convince her to leave you alone.