I think I know how your feeling but I'm in no position at the moment to tell you something you already know. Telling a cutter to stop cutting is like telling a depressed person to snap out of it and be happy. Makes the situation worse.
I wish you the best.

As far as your wife, she obviously loves and cares for you and it's good to have someone like that on your side. Espically in the moments where you doubt yourself.

I do want to say one more thing. When you doubt yourself if you can't find the faith in your heart and soul find it in your loved ones friends and family.