Originally Posted by MNBikeguy

You may find this link helpful.
http://drsears.com/
I've found most "diets" are unsubstantiated quackery. But Sears has made a significant difference to me personally.
What you describe appears to be a high sensitivity toward highly glycemic carbohydrates. It tends to be genetic predisposed. Hence, the diabetes, tiredness and bonking. I'd stop taking those power gels as they are actually contributing to the problem.