Hi Jmom2boys,
Welcome to the group
I'm glad you found us, we all have someone with BPD or BPD traits in our lives we "get it". I'm here because of my Partner's undiagonsed BPD ex-wife (uBPDxw). Like your son as far as I know she hasn't been formally diagnosed either, but sadly the shoe fits. But it really isn't about labels or diagnoses, it's really about how to negotiate the difficult behaviors that we are faced with when we have someone with BPD/BPD traits in our lives.
When I first found out about BPD, the first thing I did was read about it...learn more about it. I found it helpful to get a good grounding in what BPD is and books helped with that. This site has helped in terms of support, tools, information and sometimes just a place to vent when I need to.
I wanted to share some books you might want to check out just on BPD in general that I found helpful...
Stop Walking on Eggshells: Taking Your Life Back When Someone You Care About Has Borderline Personality Disorder by Paul T. T. Mason MS, Randi Kreger
The Essential Family Guide to Borderline Personality Disorder: New Tools and Techniques to Stop Walking on Eggshells by Randi Kreger
Overcoming Borderline Personality Disorder: A Family Guide for Healing and Change by Valerie Porr, M.A.
We also have a Library with book suggestions and reviews.
Here is a link to it...
https://bpdfamily.com/message_board/index.php?board=33.0Some of the hardest things our family (myself, husband/Dad and younger brother) have been struggling with are his violent mood swings/outbursts, unstable relationships, off the charts impulsivity and reckless behavior, and suicidal threats
What you describe sounds very familiar. Can you share some examples of what you are seeing and how you/your family have been responding? That way we can get more detailed examples we can help problem solve or share tools that might be helpful should a similar situation arise. How have you been handling suicide threats for example?
Take Care
Panda39