Is my blood sugar too low?

I've been having severe confusion, dizziness and lightheadedness. It is very severe before eating something. If I don't eat something, I get severe headaches that make me sick to my stomach. A day ago I went to the doctor as I was still lightheaded and very confused 30 minutes after eating. They tested my blood sugar about 40 minutes after eating. My blood sugar was 106. Is that normal? I forgot to explain to the doctor I had just eaten. Diabetes, heart disease and cancer runs in my family. Thank you for any help.