Blood sugar question

I went to the Doctor the other day, and he noticed that I was shaking and stumbling on my words. He brought me back in the next day to check me for Hypoglycemia. My blood sugar came back at 79 which is normal, and he wants to see again in 6 months. Well here is my question. I seem to have the symptoms of Hypoglycemia, but my blood sugar in still in the normal range. Could there be another explanation?