Coffee Girl,
I think we've talked about this before...
I'm so glad that your mom is coming around.
Your sister has her own issues. Sometimes we have to protect ourselves by not discussing medical or very private info with some people. Telling her stuff like that is just going to lure you into her trap again.
I'm so sorry that you aren't doing well physically

It isn't in your head, try to dismiss anyone's opinion of your health problems.
I know I'm cynical, but you have to protect yourself. Find other things to talk about with people who can't or refuse to understand.
Hugs,
Kay