I haven't been given anything that would aide me in carb counting apart from being told 'You're going to be referred for the course and you should receive a letter soon about it'
There are some online courses which you could do to teach yourself about carb counting without waiting for the course.
I forget the url but I am sure someone will pop up and remind you.
Those of us with diabetes have to take control. Our healthcare teams can give us some pointers (and some teams should be better) but I would strongly encourage you to read up on carb counting before the course and try it out.
Taking a fixed amount of Novarapid with every meal means you have to eat to your insulin so the diabetes is in charge. Once you learn to carb count, you can take the insulin according to what you eat - you are in charge.
I also find, if I start to do something about a problem, I stress less about it. So, if you have the capacity to learn more about diabetes, take the initiative.
Regarding your background retinopathy, as others have said, try not to worry. As you are type 1, it is unlikely that your BG was running very high for a long period of time so unlikely to be the cause of the retinopathy. If your letter was anything like mine, it said there is no need for any treatment at this stage. It is reversible.
Don't take it as an indication of you doing something wrong - as long as you are doing what you have been instructed, you are doing as much as you can at this stage. ...Until you take the next step towards carb counting.
Good luck.