Welcome Wingy!
What a wondrous thing you have done, to progress through T on your personal journey and to reach the place of having the courage to take this big step... .yaay for you! I know it is not easy, but I wish to celebrate with you that you are working hard at taking care of you and that is a big deal.

So I celebrate with you!
Those feelings of guilt or FOG as we call them, tend to chase us around in circles, don't they? I've struggled with them too, round and round, yet it is possible to get off the merry-go-round and not get back on. I think it takes practice and reminding yourself that it is okay for you to concentrate on you, no matter what age you are. I too have an uBPD in my life, and it really is a great fight to battle the inner voices of guilt that plague us. The pwBPD tends to add on to the guilt and play it for all it is worth. But it is okay that you recognize it for what it is, and it isn't yours to take on.
There are other members here who have also gone LC or NC (low or no contact) with the BPD in their family. Do you think your sister has BPD? What has helped you to figure out her mental illness?
Thank you for coming and sharing your story with us. Would love to hear more as you have time! There is a lot of wonderful information here at our sight that can help you along on your journey to healing. We are here to support one another.
Wools