Wilson the founder of AA was onto this, not sure there was much follow through on his or AA's part. I've heard it described as a very low grade diabetes too. Mayo Clinics website is pretty good for this sort of stuff. There is also the hyoglycemic diet, which basically means calibrating you diet with slowly absorbing carbs and not spiking your system with too much sugar. I've experienced the symptoms you describe, especially when I'm very physically active. I looked up a bunch of stuff a couple years ago and my take away was the hypoglycemic diet alleviates hypoglycemic symptoms (Duh), seems to work for me as I'm a whole grain convert and avoid a lot of hyper-processed stuff without going too Granola... Duh. Anyways... Try the Mayo Site if you like and maybe try googling Wilson and Hypoglycemia?