It is my opinion that they are denying you due to new abstract clinical studies compiled by the FDA that contradict your assertions. You need to google Cymbalta and you will find, I believe, their basis for your denial in the recall on specific assertions and applications made by the makers of this medication.
By no means am I saying it doesn't work wonders for you, but it's my opinion this is the legality issue and a weak reason for your current situation. (It's effectiveness)