Good move calling the police and reporting the story before any lies can be told. You've been doing great and you did great during this incident. Your WW's life is spiraling downward and she sees it. The worse it gets for her, the more vitriolic she'll get. She must be very prideful. Foolish pride. Pride can absolutely destroy a person. She knows she's wrong. Everyone knows she's wrong.
Focus only on YOU and the children. DO NOT let her take them from the family home. You're the adult in this relationship. With her violent outburst I think she's becoming unstable. Not a time for her to have unsupervised custody of the kids.
You showed great strength, restraint, resolve, and honor. You stood up for yourself, you maintained your composure, and you made sure your son was safe. That's all good stuff. Regardless of how this all turns out I think you're going to be fine.
