Hi DJmh,
Welcome to the boards! I'm glad you took the step from reading to introduce yourself and let us know what you're dealing with. It's not easy. Divorcing my ex is the hardest thing I've ever had to do, made million times harder because of our custody situation.
I found that I was doubly motivated to raise an emotionally resilient child who would not follow in my footsteps, and would not end up like his dad, really clarified what skills I needed to learn and pass on if I was going to be successful at this. Our kids really do reflect back where we are in our emotional work.
Does your 2-year-old seem to be doing ok? And your older D? What kind of custody arrangement do you have set up?
That has to be touch to see your ex after a DV allegation, with him being off medication too.
Be kind to yourself as you being to heal from this. It could be that you were drawn to be a psych nurse because you had something you needed to learn. And this is that thing, and you have access to understand that will give you some wind in your sails. My T encouraged me to look in the mirror every day and say, "You're doing ok. Good job." It was corny at first, but turned into such a powerful moment. I felt like a fraud at first, going through the motions, and then worked myself up into some pretty messy crying spectacles. Then one day I found myself believing what I was saying

Let us know how you're doing and keep posting. It really does help. You're not alone