mum2be: My kids can eat corn syrup, rice syrup, maltodextrin and dextrose with no reaction, but no lactose from cow's milk and fruits that are high in sugar like grapes, apples, banana, etc or honey. They react very badly to beets sugar. Of course, we don't eat corn or rice syrup and such since we are still on SCD, and those are junk foods anyway.
I found out all the foods that caused reaction to my kids by writing everything down they ingested and came to contact with. It's a work, and it may take a while, but you may find a connection to which sugar source more specifically with the food diary.
If you want to stop the craving for sugar, you need to decide on a date to commit yourself to say good bye to 'sugar', and start your day with a large glass of clean water with fresh lemon juice. Hot water with lemon is yet better. Another thing is to get a juicer, and start juicing veggies. If you use organic veggies, the vit and enzyme content are much higher and better for your digestion. You can also drink the water you've used to steam veggies, too.