Hello Roxy Pearl

I also have a daughter in her 30s with BPD and I have found a lot of help and support on the board for parents. There are many of us there with adult children.
It sounds as if your daughter is finding it difficult to take adult responsibility for her own decisions and is always looking to you for support and advice-and ,of course, you are then to blame if things don't work out well.
There is a very good book called "I don't have to make everything better" which helps with handling this sort of issue.
If you visit the parent's board (L5) there are brief articles on the right hand side (called "tools" to help improve communication with your daughter and set boundaries.
People with BPD suffer great unhappiness and the guilt, stress and unhappiness spreads through the whole family. It is not surprising that you feel ill and tired-it is very important to look after yourself-we talk about that too on the parents board.
It has been kind of quiet on here over Christmas. I can assure you that the parent's board is a very welcoming place and there are people there who will want to offer their support.
Many of us have been in similar situations and really understand how difficult it is.