Hi Smile
I'm sorry to hear of your struggle with this. it is fairly typical though for BPDm's to push boundaries. Mine I think depends on me feeling guilty enough to continue putting up with the shifting of those boundaries. I have learned that it is for my own protection to state what I want even if she refuses to observe what I state.
I have found it useful to compare with other more reasonable people how they respond.
Also with how I would respond to people who ask for me to respect their boundaries.
Part of that has been learning to tolerate a certain level of guilt. I look to the fact that it is simply not nice to guilt trip people into doing things for you. Particularly after they have said they don't want to. What gives some people the right to override my desires? Aren't I the best person to determine what is right for me?
These are some of the questions I would consider asking myself.
Again I compare with what other more normal mothers want from their children. They appear to me to give more and compromise more and thus find a more peaceful relationship.
In other things I take an 'accounting' view.
Eg my uBPDm refuses to accept my request that she limit the endless detail in which she talks about people I don't know and people they are related to whom I'm never likely to meet to tell a story or 7 that inevitably end with how much people love her and how wonderful she is.
Because of her refusal to accept a reasonable request (indeed it is met with me being insulted "Oh your attention span is too short" I have decided that when she does this, I will tune out and think about other things.
This is micro management I know but it achieves my end with a personal 'win' in that I don't have to listen. And if she calls me on it I refer her to her own words - "I have a short attention span remember?"
In essence can you pick one or two minor behaviours that she has eg her health issues and work out a plan that that serves you? Like giving her a brochure for a doctor or health professional who can deal with her problem? This can send a message that you will not fix it but happy to point her to someone more capable.
In the end though your guilt I imagine comes from long years of you being taught to feel guilty and responsible for her emotional wellbeing. By listening closely to the messages that you give yourself about these things, you may get to hear that the message is not in your own voice at all.
Examine your beliefs about why you should feel responsible - where do they come from? What are the worst case scenarios for you to get what YOU want? Are they mature reasonable answers? or again, are they amorphous kinds of fears? Like "if she doesn't take care of her own health issues, she may die" -isn't that true for everyone? And as you point out, you are not responsible for her health.
By breaking things down into smaller pieces you can find ways to start small and build your confidence in your judgment. As that confidence increases you will find that the guilt actually starts to evaporate.
You may wish to review the material on Fear Obligation and Guilt as a guide.
The link to it is here:
https://bpdfamily.com/content/emotional-blackmail-fear-obligation-and-guilt-fogBest of luck with this. it's not easy but in losing certain aspects of your r/ship with your mother you will gain more sense of yourself and your own rights
Ziggiddy