I am sorry to hear this
you will go on a medication roller coaster ride now I hate to say. My mom lived 14 months with stage 4 terminal lung cancer and it was a wild ride...pretty much has been since she died almost 6 years ago. I am finally getting back to normal and learning how to be my own person and not a person with a mother to support her.

I know it will be different with your sister, but hang on and do the best you can. The important thing is to keep close track of your moods, keep a journal, and be able to recognize when you might be getting into trouble.

I wish you and especially your sister much luck. I will be thinking of you both now