Hi anotheronelost,
Welcome and hello

It's hard to find a way forward when you come from a toxic childhood, that's for sure. I'm really sorry you experienced that, and then found yourself in a tough relationship. It's brave of you to start the long process of healing, to do some relationship accounting, and to reach out for support.

What are some of the behaviors you're struggling with?
How old is your son?
Is he getting any support?
If you are tight for money, and are wanting to dial down some of the conflict, there is a book you might be able to find at the library called High Conflict Couple by Alan Fruzetti. There are some skills in the book (based on dialectical behavioral therapy) that might open doors for you, especially if you feel triggered and are trying to de-escalate before the wheels come off.
Glad you found the site

LnL