Hi how's it going. I'm so sorry that you are going through this. I cannot imagine trying to navigate through not only a spouse with BPD but a child also. The tension in your household must be very high.
You've come to a wonderful community to help you work through the issues in your relationship. The most important thing for someone living with a pwBPD is to begin taking care of yourself. Anger, fear, and grief are very common feelings in many of us. We can't say the thigns we want to say. We worry and fear our partner's reactions, and we are depressed and sad that we can't have a normal relationship like many of our other friends.
On the right side of the screen there are many lessons to go through. These lessons will help you better understand BPD, how to better communicate, and how to take care of yourself. I would suggest starting there, but here are a few other workshops that might help.
BPD family also has boards for parents with a child with BPD:
https://bpdfamily.com/message_board/index.php?board=4.0What Does it Mean to care for yourself:
https://bpdfamily.com/message_board/index.php?topic=112473.0Anger and Healing:
https://bpdfamily.com/message_board/index.php?topic=75098.0