I haven't had a moment to breathe let alone be sad.
Careful with this, Sis. I know that when I was in my dark days of codependency, I was fine as long as I stuffed the feelings and just kept busy taking care of every one else's problems so I didn't have to look at mine.
It all came back to bite me when I began recovery and learned to take time to breathe and step back from everyone's problems and face my own.
Meetings helped me enormously, saved my life and saved my sanity. Maybe you and your family could try some and see if they don't help you too. You can't help your sister right now, but you can take care that her addiction doesn't drag you all down with her. Trust me, it happens to the best of us, we just hang on so long we get dragged down to a darker place than I have ever known.
Keeping you all in my prayers.
Hugs