It's very difficult to properly treat someone who is delusional. In most of the US, patients cannot be forced into treatment unless they are actively suicidal or homicidal. In my experience, it's not that doctors turn them away, it's that they refuse to accept what's really going on and leave on their own.

Hmm good call - Whilst being somewhat ethically reprehensible (Paging Dr. House!) I wonder wether this might not be a good place for palcebo's combines with whatever drugs help ?