I'm sorry to hear you're feeling so bad, partyhat. I went back and read your intro post and totally identify with being betrayed by a BPD waif. She makes you out to be her whole world, but then she needs to cheat with other guys to fill the BPD emptiness and feel relief from her abandonment fears, thus ironically driving you away and fulfilling exactly what she fears most.
Edit: I just saw heal posted that other article about
how a BPD love relationship evolves. If you haven't read that yet, please read that first, it explains so much!
Have you read this article:
Surviving a Break-up with Someone Suffering with Borderline Personality Disorder. In it there are ten beliefs that can get you stuck:
1) Belief that this person holds the key to your happiness
2) Belief that your BPD partner feels the same way that you feel
3) Belief that the relationship problems are caused by some circumstance or by you
4) Belief that love can prevail
5) Belief that things will return to "the way they used to be"
6) Clinging to the words that were said
7) Belief that if you say it louder you will be heard
8) Belief that absence makes the heart grow fonder
9) Belief that you need to stay to help them
10) Belief that they have seen the light
Do you think any of these apply to your personal situation, partyhat?
Anybody in your situation would feel many of the things you're feeling: anxiety and PTSD symptoms -- I know I have. It's not wrong, just something you will work through. Hang in there.