It is specifically designed to help combat the thoughts that you are experiencing, from the worthlessness to the suicidal thoughts. It is action-based - that you can DO something about it, in the here and now.
I have to dig a bit, but I think I can find the materials that were given to me.
You might be able to find a social worker who is trained in it who will hold a weekly group session in it (I think it is 8 or 12 weeks) - then they are committed to be on-call to help you implement any of the techniques afterwards....