Correction of wrong information:
Infection has a proven relationship to blood sugar. In times of stress (infection) the body releases cortisol which is a catabolic hormone in an attempt to raise energy sources available to the body. This results in hyperglycemia.
You should have your sugar rechecked after the infection clears up.
Your infection will not affect your blood sugar levels. Simply put, everything you eat is either a sugar or a protein that carries vitamins and minerals needed by the body to perform it's tasks efficiently. Once food breaks down, the sugars are called glucose. These are either simply or complex. If the glucose is produced in the stomach it is called a "simple sugar". These are used within about 30 minutes after eating. Simple sugars are those found in sugar drinks, candy bars, cakes, etc. Simple sugars are also in foods like fruit, salad greens, fats, milk, etc. Simple sugars are for quick energy. Glucose produced in the intestines are called "complex sugars". These sugars are from sugars in the foods you eat such as starchs. Potatoes, pasta, fats, beans (also a protein), etc. are examples of complex sugars. These are for sustained energies needed for body function, muscle use, brain function. A "balanced" diet is one that combines simple and complex sugars and proteins in a way that gives the body the vitamins and minerals it needs for your body and brain to function in an optimal state.
carbs, sugar, fruits. You need to look up what foods a diabetic should avoid or eat in moderation.