Putting this book-recommendation extract from my post below at the top here, in case it gets lost:
"The book is called STOP CARETAKING THE BORDERLINE OR NARCISSIST: HOW TO END THE DRAMA AND GET ON WITH LIFE, by Margalis Feljstad. How to end the drama and get on with life...doesn't that sound delicious?"
You don't have to live like this. There are a number of possible solutions and interventions. Know that you have choices.
I have very close family members who are like this.
There are a number of interventions you can try, and doing so might give you an insight into whether this is mental-health related, or if she's just a horrible person.
You could sit her down and ask her why she's so reactive. It's very possible that it's not fun for her to live like this either. I just read a good book about people with BPD and NPD that does an excellent job of explaining those disorders - and while I'm not a doctor, I can tell that what you describe sounds similar to BPD. It says there a biological basis for the overwhelming emotions and that the person doesn't know why they feel like this, so they genuinely think it's down to the people around them. And if you really think that the other person has totally caused this tsunami of emotion within you, then you would want to avoid them, wouldn't you? Not saying that's a correct thought process, but just outlining what the book says about what life's like for someone with BPD. Actually, that's an outdated term. It's now referred to as EUPD - Emotionally Unstable Personality Disorder.
You could insist that, for her sake, the children's sake, and the sake of your mental health, that she sees a doctor about this. Refusal to see a doctor and get help should be a deal-breaker. Things cannot continue like this. You're the stable parent, and if your mental health gets affected, where does that leave the children?
And please do take seriously that her condition/behaviour could easily affect your mental health. More than half of spouses caring for a spouse with mental illness become depressed themselves.
Is there any way you can get a break? Take the children to your relatives for a week so all of you can get a break from her? Or send her off for a spa break with a friend for a few days? Anything to get a break from her. And could you schedule an activity or two for the children so that they have a few more hours out of the house each week? Encourage them to visit friends regularly? Just to get them a bit more time on Planet Normal. (I'm not sure how old they are.) I also think you should schedule something fun for yourself one night a week, whether that's an evening at the gym or beers with friends. It sounds like you could all benefit from a few more hours a week away from her.
The book is called STOP CARETAKING THE BORDERLINE OR NARCISSIST: HOW TO END THE DRAMA AND GET ON WITH LIFE, by Margalis Feljstad. It has a lot on how to stop engaging with the drama. How to end the drama and get on with life...doesn't that sound delicious?
I fee for you, I really do. My ex-husband had EUPD, and just having to open his post would set him off. Once, when I was out, he had such a screaming fit over his computer that someone in the barber shop FIVE FLOORS BELOW called the police.
You are not alone. But you are going to have to confront the situation, and it will not be easy. You might want to send the kids to their grandparents for a few days when you sit her down.
I wish you the best of luck.