This SP article (see link below) will provide a complete answer to your "tracking sugar" question and link you to other reliable resources on ways to track "added sugar".
For diabetes and pre-diabetes---counting "total carbohydrate" intake at meals and snacks is the number one diet therapy. Have you worked with a certified diabetes educator to determine your carbohydrate intake for meals and snacks? Ask your doctor for a referral or check out classes available through your local hospital.
SP Registered Dietitian Becky www.sparkpeople.com/resource/nutrition_art