Hi kw, I'm so sorry you have gone through this for so long. I know how devastating it can be.
I'm so glad you found us. I have found this to be an incredibly welcoming place, full of helpful people who have gone through the same sorts of issues you have and genuinely care.
While you can never change another person, you can make changes yourself that will help with regulating highly emotional people's communication. I encourage you to read through the site and look through the material to see what you might find helpful. This is a good place to start:
https://bpdfamily.com/message_board/index.php?topic=347835.0You might want to focus on the Basic Tools / Immediate Help section.
What are you doing to take care of you? That is probably your most important first step..