food like eggs, nuts, and plain, lean meat without sauces or salty will be fine. Add vegetables that are low calorie and green, red, yellow, or orange are fine. Berries are the safest fruit. Some dalry fills in the spaces in the diet and stops hunger, and is easy to digest. Sugar and carbs are to be limited according to your blood sugar levels and we don't know what that level is, but apparently it is too high.
Bread, pasta, and grains are the problem and you need to do some trial and error as we all have done to find what works for us. Testing daily is helpful for prediabetes and is mandatory for high levels of diabetes so you can adjust your eating. You need to read and learn about the foods and the nutrients they contain. Just start reading on the web and asking your doctor for food lists. Don't stop eating.
This is stressful at first but worrying makes it worse. Some medicines make it worse. When I had low blood sugar and stress I drank milk and took a nap. I was fine in no time. When I overdo with carbs, I exercise or stay on my feet until I work some of it off. Peanut butter is my friend but some other food might work for you. Dorisena

Diabetes is a dietary disease though the doctor will never tell you that ! Read or look at utube, jason Fung, MD. Fasting and low carbs will bring down your numbers. I love it ! I am on no medicine, prediabetic, age 75 and 120lbs for the past 20 years. What makes the numbers go down is when you fast the body is not producing insulin, insulin makes you fat and can give you Type 2. I should say not producing lots of insulin. I have coffee with mild and water in the AM.