Hi,
It is really early days yet so don't worry, it does take a while and is probably better to increase insulin slowly.
As you gain control, keep records of what you eat, learn to count the carbs in your meals, glucose levels , exercise, and the insulin you take. It will help you to see patterns.
As said earlier, your eyesight will settle as you get things under control ( I remember that for a short time, my long sight became fantastic, I could see for what seemed miles in the distance but I couldn't see a nearby television clearly, it was really weird. )
However because it is early days things will change and after you think get things sorted you may then suddenly find you need less insulin for a while (the honeymoon period, happens to many but not all)
It will be a very good idea to go onto a course and no harm asking about it so they know you are interested. However, because of the changes during the first year you can't usually do a
DAFNE type course in the early days. (I'm not sure about the minimum age either; it could be 18)
I think that this
book is really good for people who are diagnosed at any age. It's a good primer but also good for reference when you really need it.
There are others that help managing insulin but maybe like the course that's better a bit further down the road.