Hello, Cofito, and welcome 🙂 - sorry to hear about your son, but glad that you and he both seem to be coping so well. Must admit when I was diagnosed type 1 (aged 44!) it felt like a bit of an adventure - I'd never been rushed to hospital before, and I was just ill enough to be too out of it to be scared, but just well enough to find it all quite interesting!
I agree with what everyone's said about the blurry vision - that was my first symptom, and it was my optician who first thought I might be diabetic: she said it was best not to prescribe new glasses until I'd had my blood sugar tested. A couple of weeks later I was in hospital and once I was put on insulin, and my sugar levels started coming down my eyesight kept changing - when I came out I could see better without my old glasses than I could with them. So I'd definitely wait a couple of months for that eye test.
The other thing is, I wouldn't do too much googling, or if you do, take what you read with a pinch of salt! Diabetes UK is good (diabetes nurse at hospital recommended it to me), but there is a lot of rubbish out there about diabetes, and some of it makes it sound much scarier than it is.