Cheeto2525, welcome to the group -- we're glad you found us and reached out.
You've tried hard for so long to have a positive relationship with your mother, and yet despite all the professional involvement (and your growing understanding), nothing has genuinely changed with her. I hear you wanting things to be better, to be healthy. It hurts to be unseen by family.
Can I ask, and please only answer what you're comfortable with, are you living at home still or out of the house? How about your siblings? Sometimes "helping" and "not making things worse" can vary based on the ages of family members involved. I.e., if you and/or your siblings are minors and still dependent on your mom, there'll be a different dynamic at play, and different strategies, than if you and/or siblings are more independent by age and living situation.
The big problem I have is that she may cut me off if she learns that I believe she has this problem.
Tell me more about this... what would a cutoff look like in your life? financial? emotional? both? other? more?
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I can share this with you -- my husband's kids' mom has MANY BPD-type traits (blaming, self-centered, Fear-Obligation-Guilt, never her fault, etc), yet to the best of my knowledge, she has never had an "official" diagnosis. One of the most important things to take away from this group is that you don't need the dysfunctional person in your life to have an official diagnosis for you to move forward with using BPD-centric tools, skills, and communication techniques. Whether the person ever gets a diagnosis or accepts what's going on with them, you are "allowed" to use what you learn to make things better, or, definitely, not worse.
Ugh... I'm at work and suddenly have to run... so glad you posted and reached out! Looking forward to hearing back;
kells76