My heart goes out to you. This is extremely difficult, I am sure, have you consulted with her pdoc? Does she see one, and is she on meds? Without any of this, things will be only more difficult. If you haven't already, see if you can get some professional help, counsuling (sp?) even for yourself, to have some one who is not related, unbiased suggestions on how to cope with this. I really feel for you, and hope the frustration you are having with your mom doesn't trigger anything with you.
My family went through so much with my brother back in the 60's, we all never thought we'd survive it, after several years and getting the right treatment, my brother has done well, and is on his 3rd marriage, which has been several years, things can work
Please take care now, okay?

(((((((((((( hugs to you )))))))))))))))