Hi Vintagefluffymom,
Welcome to

. I am glad that you have found your way here.
I am so sorry to hear about your son's suicide. As you say, that alone is a very difficult experience. I can't imagine what it must be like to be dealing with a daughter with BPD on top of grieving for your son. Has your daughter been formally diagnosed with BPD?
Some people who may have more of an understanding of the highs and lows of parenting a child with BPD are the people who post on the Parenting Board. Here's the link:
Parenting a son or daughter suffering from BPD boardHopefully someone else with a more similar experience to yours can comment on being perceived as a "codependent mess". I have found in my own situation that people who are not going through anything remotely similar feel duty-bound to label me or my behaviours in some way. Or offer 'advice' (i.e. tell me what to do).
This is a place where people understand and I hope that you find some answers here. Please read the posts on the Parenting Board and some of the excellent resources that the site offers.
Do you manage to have time/space to look after yourself? What support do you have?
take care
Claire