Your Doctor should have explained it or his dietitian, call them and ask them to help or for a book on Carbs.
Most Doctors tell to you stick to a certain calorie diet.
welcome....ok remember it is a healthy diet you want, not fried greasy foods, stay away from the white breads, pasta, potatoes, rice. These items have starches which can hold the numbers up longer and higher, same as the fried items.
Learn to read a food label, watch the carbs and portion control sizes ( carbs are sugars called complex and these are our problems. Most of us average about 35-45 carbs per meal and around 20 for a snack and do fine. Exercise is important also. try to get some each day if possible.
In time that hungerness will go away once the numbers come down to normal ranges, drink water when you get that urge.
Have the doctor refer you to a dietician to help, you don't have to obey everything they say, they also have different ideas. You can go to a pharmacy and they can show you how to use the meter, etc if you can't get the doctor's office/nurse to help you. it takes time, but you will get better. most of us test about 2-3 times a day, usually in the morning before breakfast, late at night, and then rotate one 2 hours after a meal, maybe breakfast, then lunch, then dinner.
Ask questions, keep asking until you do understand, keep notes on questions you want the doctor to answer or even us, read, know that knowledge is power and only you can take this and control it and it can be..