How long after meals? >1 hour at least? Does you ever have the high during meals? I'm asking because the body's response to blood glucose getting low is to release epinephrine to avoid having it drop further. If it works, you just get symptoms of epinephrine and no actual hypoglycemia (which would be easy to recognize as such). Epinephrine and norepinephrine give the same symptoms. It's easy to see whether this is blood sugar related by checking when during the day these symptoms appear. It should be inversely related to the circadian rythm of cortisol, and never occur when blood sugar is guaranteed to be high (while eating and 1-2 hours afterwards).