Please try not to worry. This is early days. Your doctor is a total waste of time.
Firstly you must ring the receptionist and ask for your blood level numbers, and get a print out. When did you have your blood test and what sort was it? Were you feeling ill at the time? Was it a fasting blood test or not? You should have both a fasting glucose result and an HbA1c result before a proper diagnosis can be made. This last test gives an average of your blood sugar levels over the previous 2 to 3 months. You need to know the figures. This is important.
Secondly, you must find out if your GP has referred you for an appointment with the diabetic nurse. This is also important for a newly diagnosed person.
Thirdly you need to sort out a suitable diet. This means as few carbohydrates as possible. Bread, rice, pasta and potatoes are the worst culprits, also batter and pastry plus the usual suspects like cake, biscuits, chocolate and sugary drink (including beer). Your pharmacist is wrong and is just churning out the "healthy plate" type of diet that is not a good idea. All carbohydrates turn to sugar once inside the system. For a diabetic, CARBS = SUGAR.
Then you need to buy a home testing meter so you can test your own levels before and after food to see what different foods do to your sugar levels.
Meanwhile, please have a good browse round this forum. The whole thing is a long learning curve and takes time. Learn as much as you can about this disease and how to control it. Basically, it's going to be down to you and your diet.
Ask any questions. Good luck.