Wow, you have your hands full! Walking on eggshells while she does the Dr. Jekyl and Mr. Hyde routine eh? Sounds like her rages did go unchecked in childhood and now they are kind of who she is. Perhaps you can check out Naranon- a place for friends and family of people addicted to drugs. You may not be able to fix her, but it's a place where you can find peace and serenity regardless if your sister decides to stop drugging or not. Please call information or look in the phonebook for a meeting near you. Hang in there and hugs to you.