My mother is normally annoying and I believe has narcissistic personality disorder. She's out of control nutty.

She's made me crazy all my life, literally. And after Thanksgiving I decided I couldn't handle her over night again. I can barely stand seeing her. She's so negative and vindictive and a passive bully.

It gets worse as she gets older. I'm supposed to be nice to her because she's old and all. And I want to, but there's history.

Is anyone dealing with anything like this? Where you feel guilty for not feeling sorry for someone you're "supposed" to love?