Welcome Brazen. You are in a tough position for sure and my heart goes out to you. It's hard to have people with mental health issues that are close to us and we can't do much for them. It sounds to me like you have done everything you can to help your wife, though, and I have to admit that I agree that you should focus on yourself and your kids. I'm not saying to never think about your wife, or feel bad for her, or want to help, or whatever. But it sounds like you are making her problems your own and, other than how they affect you personally, they are not your problems.
It can be really really tricky to separate the two. But the more you try to assume the role of your wife's caretaker - and, by the sounds of it, emotional whipping post (not a judgement, just an observation, by what you posted originally) - the more insane your life will get and the less you will be able to extricate yourself from the situation.
Unfortunately your wife is ill and needs help. The only people who can help her stabilize are medical professionals. You have tried that already and it has been unsuccessful. You can be there, cheering her on, but it sounds like right now she needs room and time to heal. And so do you.
I hope you find some support here, and that you are getting adequate support elsewhere as well.