Testing for diabetes using fasting and A1C is not adequate testing. As Jemm suggested you need a glucose tolerance test. That's going to show the real picture of what's going on.
In addition, to the OGTT which should be (a) 4 hrs with 5 points: fasting, 1/2 hr, 1 hr, 2hr, 3hr, and 4hr (b) it should also measure your amount of insulin.
Most doctors won't do this unless you ask them to. But you need both to get you a picture of what is really going on.