I have the same problem, I don't know about the low blood sugar but I've went into shock before and it felt the same way: passed out and woke up having seizure, sweating from head to toe, skin was pale and I felt like ****. But I always space out, my entire life, I either go into a trance, find myself day dreaming in another world or everything becomes "fuzzy" and I cannot focus, even when I am trying to pay attention. I find it is difficult to concentrate even when I want to, even if I need to and want to. I attribute it to the ADD. But I've also had severe dissociative symptoms like "out of body" experiences, feeling like I'm living in a dream, not recognizing myself in the mirror and having to pinch myself to see if I'm not just dreaming.