Great to hear about your success, Sugardude! Robert Atkins, the inventor of the Atkins diet, was a big believer in glutamine to curb cravings specifically for sugar and sweet things. You are correct that this is something different than generalized carb cravings.
In addition to the glutamine, you might consider B-vitamin complex. Years ago, I found this helped my curb carb cravings and at the same time reduced my cravings for alcohol. You pointed out the connection between sugar and alcohol cravings in one of your other posts, and there is some research connecting both of these to a Vitamin B deficiency. If you do this, be sure to take a high dose version with the full set of B-vitamins, not just any single B vitamin. You can get these in most any pharmacy. The B-vitamins are not fast-acting like the glutamine; you have to take them for a few days to correct a deficiency.