I think that the referral is because of normal levels of hba1c and raised blood glucose levels. That means your insulin resistance is higher than it should be.
You will probably have an oral glucose test, or mixed meal test and lots of bloods taken to ascertain the imbalance of your blood.
I can't diagnose as there could be other symptoms and conditions that I'm not aware of and it's against forum rules.
I would like to know if you have symptoms of Hyperglycaemia or Hypoglycaemia.
This would help in understanding it more.
I have an insulin imbalance even though I'm not diabetic.
You can control what ever you have, by a change in lifestyle or diet.
Most blood glucose disorders can be lived with by getting control.
I would suggest, no matter the diagnosis, you should look at the low carb forum and understand how a low carb diet, which is successful at control.