If you have not had a test for a couple of months then you should request a review. And also have blood glucose and full blood count checked too to rule out other possible problems.
To lose weight, A female will need to eat about 1200 calories daily and a male about 1600-1800. The best diet is a high fiber, low fat diet with balanced amounts of carbohydrate and protein. Drinking 8 glasses of water daily, eating 5 portions of fruit and vegetables all constitute a healthy diet. If you can fit in 30 minutes of brisk walking daily then you should see weight loss of about 2 pounds per week. This is sustainable and healthy. If you do this for a month and do not lose weight, or continue to gain weight then that will confirm that there is something wrong and you need a check up.
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