on the blood sugar thing, maybe its from to much reliance on sugar in your diet. i noticed something years ago when training endurance athletes and then read about it many times since then, eat more fat and a lot less carbs.
i found that when my athletes were massive carb eaters they would stall out faster than those that were high fat eaters. the carb heavy eaters also would have to eat before a workout to make it through and eat right afterwards. the heavy fat eaters could not have eaten for hours before a workout and be fine and even wait a few hours after a workout and recover just as well.
yes, that is conjecture and not sciencey (fun to say) at all. to add i found that those that ate lower carb, like under 40% of daily intake, would eat carbs pre workout they would last longer than normal as well. and if carbbackloading is correct then massive carbs post workout helps with recovery immensely as well as optimizing hormonal responses for getting stronger and being leaner.
this change can take weeks if not months to notice. most people that try it are so [brainwashed] that fat is bad and carbs are good just cant change their diet enough, cheat a lot, workout half ass, and are convinced that they are going to suffer that of course they do. its called a placebo effect. it can take weeks if not months to retrain your body to eat mostly fat, a lot less carbs, and feel great working out. its like a whole rewiring has to occur which once done you wonder why you even ate the other way.