Hi Holly,
I found the following very helpful. This guy is a Catholic psychologist and spiritual director based in San Francisco. He has a lot of self-help for BPD based on Catholic mystical spirituality.
chastitysf.com/
In fact, one of the personal “success stories” he has posted on there is my own. I think that his counsels are very sound and Catholic, though that is not to say that they are not challenging. His basic premise is healing through prayer and complete surrender to God. Hmmm… “basic”… actually recovery was quite a struggle for me!
Try it out. It worked for me. It might work for you. If not, that’s fine. I think it is important if you are seeking explanations about the nature of mental illness to pursue it. It is helpful to find something that fits for you, though to remember that we don’t really know. I find “models” help me, to the extent that they help in my search for meaning, as long as I don’t use them to browbeat others. The only Truth we can be sure of is the one that God has revealed to us, and I don’t think he has revealed anything authoritative to us on borderline personality disorder.
Hope that helps.
Sian x