Tips for low sugar?

After my glucose test my doctor called an said my sugar was a little low (said it was at 99) and that I needed to eat every two hours.  I went on for 5 weeks not paying much mind to it. I kept feeling weak an shaken and this morning it got bad. I had forgotten all about the low blood sugar remark my doctor had made. My grandmother came over demanding to check my sugar. I figured it would be fine I had drank a Gatorade and had 10 oven baked chocolate chip cookies (they have 7 grams of sugar per 1 cookie) 1.5 hours after my meal my sugar was only 86. I feel like my sugar may be staying low an go to the doctor Wednesday but until then any tips on food to keep it up??? I'm buying a Moniter also. I'm so worried.