You have been holding strong for so long, focusing on your kids, and self improvement. I'm so sorry that your W is starting the D paper talk around the holidays. She doesn't see how she has and is affecting you and others. Selfish.
I hate that you are going to have to deal with sharing a long car ride with her. You know what she thinks....everything is fine with you two, worked through everything, etc.....I can just picture how great she'll feel as you all walk in as a family and leave as a family. She'll justify it all in her head. As an outsider, it makes me ill, so I can only imagine how you must feel.
Stay close to family. As my mother said to me yesterday, "Family is all that matters (when you get older), even more so than health." If you have brothers and sisters, talk to them. Call your parents.