Hi Lady Rose,
Welcome to the boards!
The rest of the time (according to him and despite my best efforts) I'm ungrateful and cold. I ignore him and isolate him. I shame him. I disrespect him. I make hateful faces at him. I'm mean and always mad at him.
This sounds like it may be a "feelings create facts" scenario. People with BPD are highly sensitive and have very intense emotions, when they feel rejected/unappreciated/ignored/ashamed/etc, they tend to assume that it's a fact that they
are being rejected/unappreciated/ignored/ashamed/etc.
But, as YellowPearl said, there is help available here to learn ways of validating your husband and reducing these issues. I totally get how it doesn't seem fair that you have to help him while you're struggling so much yourself, but it can make your daily life together easier and, ultimately, reduce some of the stresses that his illness adds to your life while you're struggling with your health.
I have a serious chronic illness and this triggers his fear of abandonment. So I feel like whenever I'm dealing with a negative diagnosis or progression I end up comforting him. I just wish it would be ok for me to not be ok sometimes. I keep praying that he'll start DBT. I want more from life... .for both of us and our precious kids.
It must be very difficult having to deal with a serious illness without being able to count on your partner for support (and, indeed, having to emotionally support
him through it).
Do you have other sources of support in your life, friends, family etc? I know these are no substitute for the particular kind of support we'd hope for from a partner, but they can still help enormously.