I feel for you and like many other people here, I have felt that pain too. What will happen to my family, my kids, me? I let that pain rule my life until I finally had enough.
I am going to tell you something you may not want to hear, but its the truth. Until you detach, you will continue to have the emotions you are having right now. It doesn't mean giving up. It means you go to the worst place this sitch could go in your mind and realize that even then, you will still be alive and will still have your boys. She can't take those things away from you. Once you detach, and only then, will you stand a chance os influencing your W.
You may think you can't detach. That's natural at first. But, what choice do you have? You have no other choice if you want to save your M possibly.