Find a good doctor that is familuar with Hypoglycemia, (note hypo) Have them do a gluclose tolerance test. That is where they give you a sugar liquid to drink and draw blood every 4 to 5 hours. I had the same symptons years ago and that is what it turned out to be after a few specialist, who were not knowledgable about Hypoglycemia. I found this regular doctor thru a friend who really diagnosed it on my first visit. That was it.