Look into Hammer products as a tool for your endurance rides. I know nothing about hypoglycemia but I do deal with major headaches during high intensity or endurance rides (making me think about getting tested now)

Anyway, Hammer does not use alot of sugar which does hamper its taste a bit but when you are in hour 5 of a 12 hour or mile 20 of a 100 miler just keeping up with your nutritional intake is difficult! Hammer has been a wonderful tool in my adventures!!! I rely heavily on Perpetuem...and it does not taste too bad either!

http://www.hammernutrition.com/

***not saying it will solve your problems...just a good tool in the midst of your new diet!