I know your world has been turned upside down.

Your W is rewriting your marital history to fit her view of her current reality. She's pushing hard.

You will be fine, but you need to follow the rules. Your kids will take your lead on this. If you struggle, they will struggle. If you show an outward calmness and protect yourself, they will take their lead from you.

Really, truly, set boundaries for yourself.

Is this normal behavior for her when she's fired up?

There is something driving the bus here. Something has happened to make her feel the way she does.