Welcome Jkey

I am glad you found us here. I think you will find that this is a nonjudgemental forum that is grounded in supporting people to move forward in their personal growth, and find a path through the turmoil that a relationship with a pwBPD can bring. Lots and lots of support here, and people who "get it".
I am 58, and landed on this site in crisis one year ago. I am doing so much better now. I had heard a Dr tell my dad at a medical appt (about 15 yrs ago) that she (Dr) thought it sounded like his wife had BPD. Within 5 years my father had died. It was about 9 years after that and two counsellors later (who both told me it sounded like my mom had BPD) that I started investigating what BPD was. I had to hit my bottom, before I was ready to accept I was the one that needed to change how I reacted to my mom (because she was never gonna change). Then I started learning about BPD, which brought me to this site. My mom is 84, frail, waif-like, and I have spent large chunks of time being terrified of her. I have huge trust issues. But in the past year I've learned about radical acceptance, FOG, boundaries, validation and validating questions (SET), and JADEing. These are all tools that I use now to navigate my relationship with her. I am much healthier, although there's always more to learn and practice, but day to day I am no longer living in fear, frustration, or negativity. That's an intro to my story.
Can you tell us a little bit more about what brought you here? When you talk about the loss of your mom, do you mean she passed away, or that you recognize you won't have the Hallmark mother-daughter relationship we all wish we could have?
It sounds like your mom has conditioned you to feel like a terrible daughter. None of us are terrible daughters. We are survivors of mother's with BPD, and until we begin our healing journey, we feel like terrible daughter's. In my case, it was like nothing I ever did for my mom was good enough (and I did everything I could to win her approval...and kind of lost myself in the process). Does any of that resonate?
I am so glad to hear you have a T, husband and close friends who support you. I am also fortunate to have those things...and this forum.
Again, welcome!