How to deal with creditors when credit cards were used by wife w/ mental illness?

Maybe you can call the credit card companies and talk to someone in management. Tell whoever you speak to about the problems, and that you can provide doentation of the diagnosis. Ask if there is anything they could do to help you with the problem since she forged your information and now you are responsible. You might be surprised to learn they may help you by lowering the interest rate or stopping altogether if you can make arrangements to make monthly payments. Since you used the cards as well, this may be the best you can hope for.