Hi Eggshells20
Your MIL's behavior is really affecting you. I have two undiagnosed BPD family-members and can relate to the anxiety you feel. Dealing with a person with BPD can definitely be quite challenging and stressful.
I started seeing a psychologist, and after sharing all my stories, she smiled and just said 'it is not you'. She believed my MIL had BPD and as she explained the mental illness, I couldn't believe how much it paralleled my MILs behavior.
I can imagine this experience being extremely validating and quite possibly also very surreal hearing your MIL's behavior so accurately described like that within the context of BPD.
Also how do I separate the feeling of sadness and sorrow for this woman who is living in what I know must be her own hell and the feeling that she is toxic to me and I don't want her in my life.
Perhaps another way to look at it is that you do not have to separate anything. Both these things can be true and valid at the same time. We can care for the people with BPD in our lives without taking care of them. We can care for the people with BPD in our live, while also keeping our distance and being mindful of our own well-being. Being abused and constantly worrying about the next verbal attack isn't a pleasant way to live your life. I agree with
koseligb that boundaries are indeed very important when dealing with someone who has BPD. Do you generally feel comfortable setting boundaries with people? Do you feel you have the right to set boundaries and make your own well-being your main priority?
I can't shake the feeling of feeling like we're not doing enough to help her. We're trying to get pregnant so my doctor and my husband believe the focus should be on keeping me healthy and calm. But, why can't I shake this feeling of guilt?
Whether your MIL changes or not, is ultimately up to her and not something you can control. What you can control is your own behavior and how you respond to her. Especially considering your baby plans, it indeed would be wise to be mindful of your health.
Feeling guilty is something many of our members struggle with. However, to quote Pete Walker,
Feeling guilty does not mean I am guilty. He then goes on to say
"I refuse to make my decisions and choices from guilt; sometimes I need to feel the guilt and do it anyway. In the inevitable instance when I inadvertently hurt someone, I will apologize, make amends, and let go of my guilt. I will not apologize over and over. I am no longer a victim. I will not accept unfair blame. Guilt is sometimes camouflaged fear. – “I am afraid, but I am not guilty or in danger”."Are you familiar with the concept of FOG which stands for fear, obligation and guilt? Here's a short description:
... .fear, obligation or guilt ("FOG" are the transactional dynamics at play between the controller and the person being controlled. Understanding these dynamics are useful to anyone trying to extricate themselves from the controlling behavior by another person and deal with their own compulsions to do things that are uncomfortable, undesirable, burdensome, or self-sacrificing for others.
Do you feel like this concept applies to your own situation with your MIL? You can read more here:
Fear, Obligation And Guilt: How We Allow Loved Ones To Control UsWelcome to bpdfamily