A single blood test isn't diagnostic. To get a definite diagnosis, A Glucose tolerance test has to be performed, however a single blood test which shows a low blood glucose is a likely "non-diabtetic" indication. Do you know what kind of test it was and the result?
Weight loss isn't always very apparent in T2 diabetes.
In any case, you might find the PCOS improves and your weight goes down if you follow a lower carb way of eating.
If you understand what carbs are, you can do this for yourself, if not then there are several "weightloss diets" which are based on low carb and which might suit. You can Google these, but the best known is Atkins, then probably The South Beach Diet. and Protein Power.
Contrary to popular opinion, these ways of eating are not dangerous. You do NOT NEED any glucose in your diet for energy. You can get all you need without it. Your brain does not cease to function until your Blood glucose is extremely low and this isn't easy to achieve unless you use certain medication, such as insulin or the sulphonyl ureas. Your liver has the ability to make as much glucose as you need.
Hope this helps and that you are NOT diabetic and that your PCOS improves.