Thanks ovrrnbw, I've realised my down times coincide with a lack of sleep the previous night. Yesterday, my eldest said they can't remember me ever being grumpy.
I'm staying calm and cool and not getting involved in W games. I've recently been declining her offers to get in the car with her for a lift when we meet once a week at the change-over for the kids. I think she would have noticed I've let go as that's how I felt the last time we met. I laughed to myself about her so I would have seemed happy.
I rarely contact her and only then related to the kids but today I sent a message asking if she would share the govt money we receive for the kids as it gets paid to her name. She said "Sorry" that she hadn't shared it and would do so and back-date it. It isn't much money but it helps. It's the first time she has said sorry for years but her words mean nothing to me at the moment. She has little option but to share the money anyway because it could have looked bad on her in court. Besides, it's a drop in the ocean compared to what she is taking to hide.