Cindy;
Welcome to the Forum! Congratulations on the weight loss!
1. The "carb application" for your iPhone is a tough one, since there are several. I will tell you that I use two different "free" ones. First is "GoMeals" which does a good job with counting carbs and it gives you total carbs per meal. Second is "Lose It!" which does a very good job if you are trying to lose weight. It does not add the total carbs per meal up for you, but you can do this with your calculator, since it does give you the carbs per meal item. This is the app that I use the most.
2. I am not sure that the no carb diet is good for your system. I would think that introducing some carbs, as in a low carb diet would be more beneficial. There are several books and websites for the low carb diet and its benifit to people with T2 diabetes. May I suggest starting
here? Yes, I think that your readings will improve as you lose weight, atleast it did for me. Good luck! I hope that this helps in someway!