Hi Lilly,
Welcome to our online community.
Does your mother also live in Germany? Does she live with you in your home, or in her own home?
I am sorry that she is so difficult, and frustrating and abusive. There are many people on this forum who can relate to how you are feeling.
I understand what you mean when you say your mother is always a victim. This is how borderlines see themselves, and they blame everyone else for their bad feelings.
It is good you are in therapy. If your therapist is not helping you in the way you need, but just telling you to leave your family, you could always look for a new therapist. Maybe there is another person that could support you the way you need.
I've made therapy, but their solution is: left your family, and if your mother should try a suicide, it is her problem, not yours...I mean, she is my mother and sometimes, she is wonderful. I would never could be happy if something would happen to her because I left her.
Suicide is never someone else's fault. No one else is "responsible" if a person chooses to take their own life.
I am feeling so alone and overwhelmed, and can't see the solution.
You are not alone. All of us are overwhelmed at times. The solutions are not easy.
The short answer right now is that you should carry on with setting boundaries, and understand that the boundaries are for
your well-being, and
not to change her behavior.
Understand that her behavior will never change unless
she does the work necessary and wants to change herself.
Therefore you must look after YOU. We call this "self-care". Learning how to take care of our own needs takes time to learn.
We can help with this. But can you tell us a little more about your situation? What is happening right now that is making you feel overwhelmed?