Guga, diabetes is a disease of carbohydrate metabolism. We have problems with blood sugar rising when we eat carbohydrates. There are ways to combat this.
First, be at a healthy weight. Even a 10 pound gain can cause your blood sugars to rise.
Second, watch how many carbs you eat at each meal. That is important.
Have you been able to talk with a dietician, a person specializing in nutritional diets for various diseases? Your doctor and/or a dietician should have mentioned the amount of carbs you can eat per meal (what is best for your body.) Everyone differs when it comes to the amount of carbs.
Third, be as active as you can. Being active helps your body utilize glucose better. It won't build in your system and cause high blood sugar numbers.
You need to try and keep within the ranges as best as you can. First thing in the a.m., your BS should be 70-110, two hours after a meal should be under 140. Before bed, 70-110.
Many diabetics will have a rise in glucose during the sleeping hours thanks to the liver releasing glucose. Many will see a higher number in the morning and then be in range throughout the day.
You don't need a health food store to shop for healthy foods. Eat more complex carbohydrates, which you can find anywhere. Stay away from simple carbs like white flour breads, pasta, rice, potatoes. Limit the carbs at your meals. You can experiment and see what works for you.
Do not be afraid to call your doctor if you are worried. Something is not right when you spike to the 200-250 range. You either ate too many carbs and/or the wrong kind. Flute is right regarding the number of grams of carbs per day. You may need to restrict them further. I even go less than 100 grams of carbs per day because my body does not tolerate carbs at all. I use two insulins to keep my blood sugar within the normal range. I cannot eat any carbs without my sugar spiking. But that is just me. Not everyone is like that.
Eat more vegetables. Fruit is good if you don't get a huge spike. Eat protein with your fruit if it causes a huge spike and see if that helps. Add more fiber to your diet. That slows the absorption of glucose into your bloodstream. Keeps it more steady. Your protein should be as lean as you can find it. Adding more fat to a diet does not help diabetes.
Wishing you luck in this endeavor. Let us know how you are doing.