Hi
Nopuppets!
I want to jump on in along with the Wolf and welcome you.

So glad to have you join us.
My mom was also like yours, an uBPD (undiagnosed BPD). Truly it IS overwhelming and much to digest at the first moments of the light coming on. I certainly understand! You asked
How do you ever come to terms with the pain and heal?
It comes one step at a time, one day at a time and a T session at a time. Don't loose hope because you feel it is either too overwhelming or taking to long. I think it takes time to settle with the discovery first, then the question comes up as to what do I do with this information now? I'd like to suggest a book that has been very helpful to me as I began to unpack just what it meant to me to have been raised by a pwBPD:
Surviving a Borderline Parent This book can easily be used with your T as you work through the suggested questions and thoughts.
No matter where you are in the list, take the time you need. This isn't a race to achieve. It's time for you to heal and provide care for you.
Wools