Getting frustrated with your DN does no good. She is what she is. You wouldn't shout at the clouds or howl at the moon. DNs, and GPs, are the luck of the draw. My last GP was excellent, first class, this one, not so good. I can imagine some of his patients have told him that too so I bet he has gone home some nights and wanted to cry himself to sleep. Get yourself informed about your diabetes, there's loads of people in the same boat. You will become your own expert.