Hi Jack-a-Roe;
It's good that you recognize needing more support right now. BPD relationships are some of the most challenging relationships to navigate; the more support we have, the better.
Honestly, one place to start is you could consider sharing these thoughts with your current T. Just talk about where you're at, what you think you need, and what you're looking for, and see if your current T has any recommendations. Of all the persons in the world, T's have the potential to be most skilled at hearing "rejection"

and navigating that in a positive way, so you don't have to worry about "saying the right thing" or "letting your T down easy". Worth a try to show up and say "I've been thinking _________, I'm looking for _________, I wonder if you have any recommendations".
Another option could be the psychologytoday.com "find a therapist" feature (at the top of the home page). Enter your location, then when it shows a list of therapists, there should be an additional menu saying "types of therapy". Choosing DBT will likely get you T's with experience and background with BPD, and really, getting some DBT isn't bad for anyone. It can help the "non's" as well as the pwBPD. You could even contact a few of the DBT practitioners, share your situation, and again ask for recommendations.
...
She hasn't felt safe talking to me since. It feels like I'm being treated like a monster because I am asking not to be yelled at for no reason. She said that Easter was a turning point and I'm just very scared, alone, and sad.
Did
she say that?