As above, for me the thing standing out the most, is that the results you have mentioned are far from convincing. Definitely get tests done as outlined above, before embracing this diagnosis.
It's not much, but it's quick and dirty: the ADA page on pre-diabetes levels.
How to Tell if You Have Pre-Diabetes - American Diabetes Association
Note that the arrow-graphs are for specific tests you may have access to through your doctor, Fasting Plasma Glucose and Oral Glucose Tolerance Test. Not just random BG tests.