Must have been a bit of a shock - the good news is that a classic type 2 can get back to normal numbers by cutting down the high carb foods, cutting down on the middling ones and indulging in meat, fish, eggs, cheese, yoghurt with some nice veges, mushrooms, berries, salad stuff - and coffee with cream.
It can seem difficult at first, but I'm now approaching 6 years from diagnosis and feel great.
If a low carb diet doesn't have a good outcome then it is likely that there is more to the situation than appeared at first.