Do we have the same sister?

Mine is twelve years older than me, so she still thinks of me as "baby sister" even though I'm almost 56 and I have a disease she knows NOTHING about. She thinks she's trying to "help" me but says things that hurt and then she goes negative on me ("you just need to straighten up"---this from a woman who suffers from chronic depression herself!). THEN she steers the conversation to her own issues and literally tries to have mental-illness pissing contests.....she's told me she envies me because "at least you get the highs" and goes on to talk about all the bad stuff I've done during my manic episodes.

I think she's just overly self-centered and likes to create drama where there is none. She doesn't get me and never will, so I can't spend a lot of time with her because her behavior is so triggering. I have to remember "not my circus, not my monkeys" so that I don't take on her issues in addition to my own.