I think the low BGs we get are one of the major factors that contribute to so many of us getting easily stressed. My private theory on this is this: Low sugars leads to a cocktail of hormones beeing released and this coctail is same as the cocktail beeing produced when your are stressed or getting scared. Hormones countinue to linger in your body long after the BG is back to normal. Maybe your body isn´t even back to normal when next low is coming, maybe not a big one, could be a low you don´t even notice but your body does. After years and years of episodes like this your body goes more easily into a stress response because this is what your body knows, it remembers stress and this response is therefore easily triggered. Stress weakens your ability to cope with stress. And if new stress is coming before the last one has disappeared, you´re in a chronic state of stress.
Just a thought. On top of that you get all the mental and emontional stuff off course.