Hi Leslie. I am sorry that I do not know you yet, but what strikes me in your post is more than about your son "needing" therapy. What I am "hearing" is that you are seriously ill, your son is dealing not only with stuff other 17 yr olds deal with daily, but also with the divorce of his parents, and a Mother who is seriously ill. Would it be a possibility that he would be more open to the idea of seeing a therapist to discuss "your" needs - to discuss not only the 17 yr old stuff, but talking about dealing with a loss of an "intact" family, and a sick parent ? IMHO - he could be really confused about alot of issues right now, and therapy could certainly help him, but if presented to him in a way that YOU need to go, and would need or want his assistance might make him a bit more receptive. Going to a therapist at his age could be a bit intimidating to him, however, if he won't be the "center" of attention - at least to begin with, he might go, wanting to help you ! Perhaps after a session or two , as the talking starts, he would be comfortable enough to discuss what is going on with him. Just my humble opinion.

Good luck !