Do I have a common blood sugar problem or is it just me?

I don't have Hypoglycemia but when ever i get stressed or tired I kind of throw hissy fits and I start crying for really no reason. Once when I was going through one of these fits my mom had one of those blood sugar testers and she tested me and I had a very low blood sugar. Once I ate something a half hour later I felt fine. Are these sudden drops in blood sugar good for you? Can they be a predecessor of something more serious?