Hi & welcome to the forums! That must have been scary to find out how high your sugar levels were! Wow.
I'm not diabetic but I've been diagnosed as pre-diabetic. It's been a wake-up call for me to get my diet under control. Unlike you, I have weight to lose and lots of it! I've been trying to follow the Insulin-Resitance diet where you link & balance proteins and carbs. Basically you need to have 7 grams of protein for every 14 grams of carbs and no more than 30 grams of carbs every 3 hours. I'd be interested in learning about the diet that's been prescribed for you. Are you adjusting well?