I'm going to leave my mentally ill mother behind
I never heard of anyone leaving behind their mentally ill parents before.
I probably never met such an uncaring son such as myself. I leave her behind because she is not physically or mentally present for me
You are an uncaring son, indeed. How can you leave your mother like that and not support her when she is obviously very ill? She needs your help the most and you are betraying her trust, making her life even worse.
I know, but I can't do anything for her, also I'm a son under a lot of pressure. I have a lot of other obligations of my own.
Trying to care for everyone we need to can be difficult sometimes, especially when we have a rocky relationship with someone. Is she too ill to care for herself? If so, are you able to help make other arrangements for her?