Hi Yviefree-
I'm sorry to hear that things have been difficult and that you're going through a divorce, but it is great to see you reaching out for help and support - a very brave and scary thing to do! And it's great you're in therapy!
This site is a support group for those who are or were in a relationship with a person with BPD, so many of the posts can be triggering to a BPD sufferer. There are resources of the type you're seeking. Please check out
Resources for BPD Sufferers.
Splitting - Protecting Yourself While Divorcing Someone with Borderline or Narcissistic Personality Disorder is a book that comes recommended, although it may be triggering also for someone with the disorder.
I wish you well on your journey.