Hi echo-I see lots of good solid advice already & support-just want to add my support & say I know how rough it is when people that should be closest to you are not supportive. My parents are not-my Dad has the whole "I don't believe in mental illness" thing-it sucks. For me some days it still bothers me others it doesn't-you can't control what your sister thinks or believes-if she would be open to going to counseling with you I've found a 3rd party mediator to be helpful in cases like this. Take care of yourself, listen to how your body is feeling & try not to waste precious energy if she just doesn't get it.