Hi Haley Plumb

I am sorry to hear of your distress. I landed on this website when I was falling apart too. That was last summer. You will find lots of support here. It can get better.
I also offer my condolences at the loss of your brother. It is a double loss, because as you say, he was the only one who really understood the experience the two of your shared within the family dynamic of BPD right?
I am an only child, living in the same town as my mom. Nobody around me (except for husband) has ever had a clue either. It's so isolating to have no one who shares the same experience, or who can understand, right?
The good news is the people on this forum "get it".
My mom's symptoms have intensified a great deal since my brother had passed away,
This happened to me too, after my dad passed away (15 years ago). Now that I understand BPD, I understand why.
she lashes out on me, threatens suicide, mentally/emotionally abuses me on a regular basis and essentially takes me on the emotional rollercoaster she's riding and its eating me alive. i've seen this take a huge toll on my mental health so much to where i've inherited unhealthy patterns/defense mechanisms and severely low self esteem.
What is your living arrangement? Does she live in the same town as you? Or does this abuse happen over the internet/text/email? You mentioned she lives alone in TN, but I'm wondering if she's across the street, or a few hours, or states away? Knowing that could aid us in helping you move forward with coping strategies.
none of my friends or family understand nor are they involved in a way that gives me any relief
I'm curious why "family" isn't involved with her. Is it because of distance, or something else?
i feel like if i were to cut her out of my life temporarily and she took her life, i know i would feel responsible for her actions for the rest of my life even when i know its not my fault. i don't know if cutting her out will push her off the ledge
This is tough. So you know that suicide is no one's fault, and yet you mention you would feel responsible. This is because she has trained you to feel that
for her. This is called FOG (fear, obligation, guilt).
Here are a couple of links about FOG if you aren't already familiar with this concept.
https://bpdfamily.com/message_board/index.php?topic=82926.0https://bpdfamily.com/content/emotional-blackmail-fear-obligation-and-guilt-fogI once had a counsellor explain to me that some of his "BPD" clients would talk about suicide. He would say "let's call the ambulance right now". Almost always, they suddenly weren't suicidal any more. On the other hand, if you feel your mom could be at risk for suicide, then it would be appropriate to call for an ambulance. This could be an important step, because then there is also a health record of this, should it become a pattern. But if she is saying things that make you uncomfortable (hinting at suicide), this could also be an inappropriate expression for how low she is feeling. Maybe, in this case, you could try SET, and see how that works?
https://bpdfamily.com/message_board/index.php?topic=143695.0;all(keep scrolling down)
Perhaps SET could help her feel validated (a good tool to use with pwBPD who are in the throes of an emotional dysregulation). This could be helpful for both of you.
you can only set so many boundaries until they keep getting broken again
Can you give us an example or two, of boundaries you have set that have been broken?
i feel like i'm falling apart.
Super important to take care of
yourself
. How do you do this right now?