Open Question: If eating sugar makes you really tired or dizzy, can that be a symptom of hypoglycemia?

I love chocolate, but whenever I eat (or any other type of sugar) I got very tired, I feel dizzy. I heard that this is the symptoms of diabetes, but I do not think I have type 1 diabetes, because I do not have this many of the symptoms, I do not because I am not fat-type I do not even eat a lot of sugar. I have a lot, but the symptoms of low blood sugar, especially tired all the time. My mother thought I was, she had it so I might be too. However, this is a symptom of?