This is what we mean by manning up. Make it happen for you. It isn't what she does or doesn't do. She knows you need the car to go to work. That's why she took it.
Now what they mean by changing is that are you going to show her you are a man and she married a man. Don't be the boy and mommy took the car away. MAN UP! This may sound harsh, but it is not meant to be. Look at yourself. You don't need her. Yes she was your life, but you have to realize she isn't your life right now. Stand up for yourself.
Stop making excuses.
I have a truck, if you lived close I would let you use it. However all I'm doing is enabling you.
Go cut grass. Shine shoes. Deliver Newspaper. Collect cans... do what it takes. The busy stuff will get you mind off the situation. While your doing those things the anger will help you detach from her. Don't use the anger against her. Use it as a tool to detach from her.
Do it!
Mycroft... It is most likely normal to have gastro problems after not eating. You must eat in smaller doses. Even if it is a spoonful of peanut butter an hour or something.