I know that Cymbalta has been prescribed off label for quite awhile for diabetic patients who have diabetic peripheral neuropathy, (nerve pain) and that the FDA finally went ahead and approved it for treatment. Some doctors have reported that there was a lowering of blood sugars because extreme pain can cause blood sugaar spikes and ketones. (diabetics also have a higher risk of despression anyway)

I would write down all your questions and call the p-doc and ask them. (Have him at least clarify why you are taking it) If he is not immediatly available have him call you back asap.