You are not alone. So many of us have had similar experiences (although mine has not involved injected insulin).
It is incredibly difficult to distinguish between the carb-craving eating, the emotional eating, and the genuine hunger eating. In my case I believed I had an eating disorder, with accompanying depression, for years before I finally managed to lower my carb intake to a level that didn't trigger the cravings. But not before I had binged and starved my way through several very destructive yoyo diets. Thankfully, that pattern of eating is a thing of past for me, but I remember it very well, and there are several other people who post here who have had similar experiences.
Please do not be embarrassed, and please keep posting.
You may find this thread an interesting read.
http://www.diabetes.co.uk/forum/threads/support-thread-for-those-of-us-who-dont-lose-weight.112253/