Hi vickie,
not really sure how you deal with this, but I'm guessing that no amount of nagging will help - that would mean the adult wins, and no teen wants that. He needs to come to the realisation on his own, or at least he needs to believe he's done it on his own.
There's no reasoning with teens. I work with them now and half the time I'm convined they're all crazy or stupid, but really it's all the hormones and the general weirdness of not really being a kid or an adult and trying to work out who you actually are. Combined with such high sugars, there's not going to be much logical thought going on. When I was in my teens my sugars were all over the place and I was completely unreasonable when it was very high. Apparently I pushed my sister against the fridge and she has a scar on her face, but I can't remember that at all. I was pretty much non compliant, I used to steal money and spend it on chocolate, or I would do massive injections so I would go hypo and have an excuse to eat lots and not go swimming. Then in later teens I used to binge drink and took a lot of drugs. Surprisingly I only had to be hospitalised once for dka, and that was from food poisoning, I didn't know you still had to inject even if you couldn't eat, and obviously I wasn't testing.
The thing is, I never really considered how dangerous all thus could be for a diabetic, and frankly I didn't care. The idea that i would ever be 30 or have any responsibilities was an alien concept! Most kids don't yet have the capacity to think about the future or consequences.
Now I'm 31 and looking back I think I was a massive idiot. But no amount of nagging or general shame and guilt made any difference. It's only really in the last 2 or 3 years that I've been trying to be sensible about it. Getting retinopathy and having laser scared the **** out of me! I really don't want to go blind. That was my initial wake up call. Then I read Ellen's post about her husband and I realised I never want to cause that sort of pain to the people I love. So I did the Dafne course and I'm really trying my hardest now.
It might be worth trying to persuade/ bribe/ blackmail your son to go on a Dfane course. For me it was kind of a revelation. Meeting other diabetics and sharing experiences also helped a lot, and so does this forum. It's good to know you're not alone.
I really hope you don't take it personally when he seems angry at you. I used to resent my parents for giving me their ****** genes but obviously now I'm out of that horrible selfish teenage phase, I'm over that! Mostly... (I still don't appreciate inheriting shortness!) He loves you really and one day he'll realise it. With sugars like his I'm not surprised he's angry and badly behaved, it really does mess with your brain and make it really hard to control yourself. I think someone on here said they filmed their kid being evil and played it back to them later. That might also be worth a try.
I'm really sorry you're having such a hard time with your son. Eventually he'll grow up and start taking it seriously, unfortunately some of us just take longer to get there! If all else fails, I'll lend you my pointy stick
hope it all gets better soon. Take care x