Hi Doh, I understand your frustration. It can be extremely difficult to love and support someone who has bipolar. The most important thing to remember is to take care of yourself first! The only way you can be there for your sister is if you are healthy yourself. Maybe a few sessions with a therapist who understands bipolar would help--they might be able to give you some good coping ideas. Letting your sister manipulate you and your feelings is not helping her. Please, take care of yourself.