you can NOT rescue your wife from the choices she has made.
As hard as it may be to see her going through this you have to shut your mouth and sit on your hands and do NOTHING!!
This is very co-dependant behavior. You can not fix her right now and unfortunately, just like all of the rest of us LBS's we are dealing with the consequences of their behavior.
Yes it causes us great pain, screws up our kids, our finances and our lifestyle BUT they have to deal with their issues on their own.
In this situation you can not be the White Knight coming into save her and rescue her from herself.
This is not a fairy tale.
This is MLC.
This is your new reality.
I am sorry, I really am.
You have had a really rough life and dealing with an ill child and now a mentally sick wife it is amazing that you have not snapped.
Please take care of YOU. Do what is best for YOU.
There can be no testimony without a test. I am praying to go through this test and come out the other end with a new and better marriage then before.