Hi Curleous,
Welcome to the forum. Thank goodness you have been put on insulin. I am amazed that your Dr put you on Metformin when you had ketones - this meant that you were developing Diabetic Ketoacidosis (DKA), which is a life-threatening medical emergency. On no account stop taking your insulin, and read up about DKA. I cannot believe how many GP's assume people have Type 2 when, like you, they are young and displaying all the signs of Type 1, it is truly frightening.
Anyway, you have your insulin now, and are on the steep learning curve that a diagnosis of Type 1 brings. Your blood glucose readings will take a while to settle down, so try to be patient. In the meantime, you need to know that ALL carbohydrate is converted to glucose by your body, so it's not just the obviously 'sugary' things you need to cut down on. Have a read around the forum about what people eat and don't eat and how they balance their food with their insulin doses. Although it is a contentious issue ( :shock: !) around here, I believe you would benefit from reducing your carbohydrate intake. However, your insulin also needs to be carefully adjusted as this is done or you will hypo (go low). Are you being referred for any specialist help?
Best wishes,
Sue