Thank you all for your support through this. Things have changed dramatically over the past couple days. I was able to stave off my anxiety using some techniques the therapist gave me, and I personally feel fine. My girlfriend is happy once again, for now, but I know that her problem still exists. She has a tendency to shift between extremely happy and idolizing of me to extremely angry and demonizing of me in the blink of an eye (part of the source of my anxiety... but now that I understand and expect that kind of behavior it doesn't bother me as much).

Hopefully, though, now that she's in a good mood it'll be easier to get her to think about treating her problem. I bought a couple books about treating borderline personality disorder, and living with a borderline partner, and I'm sure they'll be insightful once they get here and I have a chance to look at them. =p

Thank you all once again for your advice and support. I may need it again in the future, but for now things are looking up.

Evan