I also ended up hiding the credit/debit cards and the car keys. It seems harsh but it really is a practical thing to do. My husband just thought that he had misplaced them all and I just let him think that.
My husband did alot of online shopping in December 2011, when he was home and terminal. While he was being sweet and buying Christmas gifts for others, he would often say that he didn't know what he was ordering, etc.... He did not want me to help him. I was terrified to see what the credit card bills were going to be.
Your husband is obviously struggling and that is understandable, but you need to take practical steps for your family.
God bless as it is all so hard, Sally