Hi,
I would highly suggest that you get some counseling on this matter. I understand what your going through as I have mental illness & on disability. Somehow your Wife needs to understand your side of things. Although I don't know her she sounds real selfish.
And you can't keep this up either.
There is just too much expectation here for you to do everything.
Is there any way to get some help around the house?
Can you open up to your Doctor and ask him for his advice tell him its real difficult around the house with the demands that your Wife places.
And add to that trying to get your kids ready for school + the errands+laundry+fixing dinner. Gee, reverse the gender & you have my Step Dad when I was growing up cause my Mom had to do all of that only difference she didn't have physical disabilities.
It seems to me that your Wife resents you.
That is going to have to be addressed by a therapist. No if's, and's , or but's about it.
So talk with your Doctor or as its called in 21st Century your primary care provider.
Because this situation if it isn't resolved in some kind of way will get worse!
And you don't want that. I know that it must be scary, but everyone has to work together. And I don't want to see a Family break up over something like this.
I hope it helps.
If this is overwhelming? Take some baby steps but do something and talk to someone.
Good luck!