435 isn't just high, it's extreme. You need to make an immediate change in your lifestyle. 70-80 carbs a day is an OK target, but its too high for your first few weeks.
For your first week diagnosed you should do the following things 1) do not eat anything other than leafy green veggies, meat, and cheese. If you can do it, don't eat anything. You do not need food right now, your body is absolutely over nourished at the moment.
2) cardiovascular exercise. 30 minutes every day. Something that makes you sweat. (treadmill, rowing machine, biking)
3) start learning how to count carbs and judge foods based on net carbs per 100g
In week 2 you should do the following 1) start learning how to use your meter effectively. learn to observe how the food you put into your body effects your blood glucose level. Before each meal test, test again 1 hour after the meal, and test again 2 hours after the meal. You might want to do something similar with exercise. Test once before exercise, test again 1/2hour after exercise.
2) learn how to integrate other vegetables into your diet (hopeful you've learned week one lesson 3)
While doing this, if you follow my advice you'll start to feel weird and tired for a day or so. Depending on how scared you are (and you should be very afraid right now, like I said, your numbers are extreme), you may feel hungry... more fear = less hunger.
After the weirdness and hunger goes away, you'll feel ON_TOP_OF_THE_WORLD
You'll feel great due to your body finally getting out of hyperglycemia which basically makes you feel depressed and tired. You'll feel less hunger pangs as you'll get off the carbo rollercoster. Once you're at this state, your blood glucose checks should be closer to normal (normal being between 70-100), and you can at this point decide how you want to take your treatment.
You should not be feeling depressed right now, you should be feeling fear. This is going to be a very difficult fight, and if you don't win you're going to die young, blinded, amputated, on kidney dialysis. BUT YOU CAN WIN.