I'm sure many here have gone through the same revelation like a cold bucket of water poured over you head.
It is not just the big dramas but you will see how it has permeated every part of your lives, even the good moments.
I also understand your guilt for not having the necessary "how to manual" for protecting the kids. You defaulted to doing nothing because all attempts to stop it probably made things worse. As you say you confident nature was probably just a facade to help you get through this.
As you are now more aware and are at least committed to staying for the immediate future, you will find there is a lot you can do. Not to "fix" you wife but to stop making it worse and lessoning its impact on you and the rest of your family.
This will give you a sense of purpose and direction. Control will come back to you along with a greater awareness about human interactions in general. It can bring about a great sense of reward in improving YOURSELF.
It will be hard, but it will be easier to deal with if you shift your target from staying for now, to just staying. The option is still there but if you decide you are staying by choice rather than default that in itself is empowering. Self empowerment and living life by choice is one of the goals to be aiming for.
Good luck
