Glucose Tolerance Test?

I had a glucose tolerance test performed on me just a couple of days ago. After drawing the first vial of blood we asked what my blood sugar was before drinking the orange sugar drink( I also had not eaten anything). My blood sugar was 91 without eating or drinking anything. My parents are concerned that I have diabetes, and the results do not come in for a few more days. I have headaches all of the time. When I eat sugar my headaches go away. The other day when I had the test done I had a terrible headache, and when I drank the orange sugary drink my headache went away, but returned minutes later(even worst). I also have purple/blackish colored toes, dizziness, irritability, blurred vision, and I have dropped 10 pounds over the last few months(without changing my diet). I am concerned that my blood sugar drops sometimes and spikes up sometimes. Please answer my question!