Don't worry too much to start with about all the more techie details of HBA1C, etc. - just check out the
recommended targets for diabetics, and aim for eventually reaching them, and your target weight. You've got a lot of new stuff to cope with so leave all the finer details till later. I think most of us are completely befuddled to start with and it feels as though it's all a weird foreign language...
Put very simply: for whatever reason your body isn't able to handle carbohydrates very well any more and this is causing your problems, so one solution is to stop feeding it too many and change to eating other (better) food instead. Have a look at
Viv's Modified Atkins diet post which is a good guide on what to eat and what not to eat if you are going to watch your carbs. Basically you should remove all sugary, starchy carbohydrates from your diet, and instead try to eat lots of green vegetables and salads, plenty of all sorts of meat, (oily) fish, and butter, eggs, cream ,etc. You have to learn what you can and can't/shouldn't eat, and go from there. This should not only help you lose weight, but once you body has got over the initial shock of having a new and different sugar free diet, you should also start to much better and more alert.
Robbity