Hope546 and welcome to the family! I am so sorry to hear what you are going through. Many of us have come to this site in desperation and found comfort here. Because we are all going through very similar experiences.
I don't know when you said walking on eggshells if you knew about the book "Stop Walking On Eggshells" by Paul Mason and Randi Kruger. It was an eyeopener for me and many others to get that perspective on our experience.
Here's a good place to start in getting closer to a sense of the problem. Most of us are dealing with loved ones who never get a formal diagnosis, but it helps to learn to identify the signs.
https://www.bpdfamily.com/content/what-borderline-personality-disorderHope546, do tell us more about your experiences" You will find it helps you to get it off your chest and we can help better if we know more precisely what the problem is. In the meantime take care, we are here for you.
hugs,
khib