Hi Busy-Bee, welcome to the forum
🙂 What you are experiencing is not unusual for the first few weeks. Learning to manage your blood sugars well can take time as you gradually build up experience of how different foods in different quantities affect you personally - people can have varying tolerances to the same food e.g. one person may eat weetabix and their levels will shoot up, but another may be able to keep quite stable levels eating the same thing.
I would recommend having a look at the
Useful links thread, and would particularly recommend the book
Type 1 Diabetes in Children, Adolescents and Young Adults by Ragnar Hanas - an indispensable guide to Type 1 diabetes whatever your age
🙂
Have you been offered any education courses yet? These courses will instruct you on how to adjust your insulin doses to match the carbohydrate content of your meals and also to take account of different activity levels, time of day, what to do when you are ill etc. Popular courses are DAFNE (Dose Adjustment for Normal Eating) and BERTIE (not sure what that stands for!), but your PCT may offer their own variation.
If you haven't yet been taught how to vary your doses according to carb content (carb counting) and other factors like exercise then it is almost inevitable that your levels will swing. I was talking to someone recently who hadn't been made aware that it was the carbohydrate content of meals was important in determining doses, so would give a big dose for a big meal and a small dose for a small meal even if the big meal had few or even no carbs.
Your eyesight should settle down once your levels become more stable - mine took about 6 weeks before my eyesight returned to normal, and it is important not to get new glasses until levels settle otherwise you may need new ones a few weeks later!
Please ask anything you are unsure of, there are lots of friendly people here with a wealth of knowledge and experience, so someone can usually help out - no question is regarded as 'silly', so if it is bothering or confsing you, please ask!
🙂