Firstly, I am really sorry you are going through this at the minute however it is a positive that your sister felt able to disclose her story to you. It took me over 9 years to be able to tell my family. This was the hardest thing for me, I guess I wanted to protect them from the truth but looking back now I know I made wrong decisions. Apart from the fact that it was something I just didn't want anyone else to know, I didn't want to believe it myself, but my greatest fear was (and still is) that people would treat me differently. I really hope you can find a way to be the way you were with your sister. Her giving you the go ahead to seek help just shows how much she cares about you and she is probably hurting right now that your relationship has been affected now also. You have come to the right place, I am new here myself but already have found it a great comfort. I hope you can work through this. Take Care.