Im in a similar situation with my mom. SHe is 77 and constantly telling me every single day that she doesn't feel good and she needs me to live with her. I couldn't do it unless we lived in a duplex!
It's a long story. But, I am really fighting the guilt trips by rationalizing the fact that if she lived with me, I would be the one who would not be feeling good!
I have to say I agree with everyone. She's able to help herself when she wants to, but, like my mom, want's someone to dump on, and you're it.
I really hope it isn;t lukemia. I know that would be devestating to you. But, until you get the diagnosis from the doctor himself, let her take care of herself.