Well done for having the test, I think that was better than to wait until the doc's on Friday. Did they tell you what your count was? Well controlled Diabetes (or a non diabetes person) is between 4-8, when DH was first diagnosed he was a whopping 16!
When you have your fasting tests they will probably do a routine blood test called HBA1C - this tests the glucose levels of a blood cell over it's 120day life span and can give you an idea of what your average count, DH's average was over 10, the higher the number the worse the symptoms of Diabetes generally are. This is an important test and can help determine IF you are Diabetic, how long you have been Diabetic. They will also do routine colesterol tests. As you know, you'll end up having more eye tests too.
You're probably quite shocked, I remember DH being quite shocked before he went for his fasting tests. Have you found out if there is any Diabetes in your family?
Best of luck to you Paul

I'm not the worlds authority by any means, but if you are diagnosed Diabetic and you have any questions just PM me....
Be careful what you look at on the internet too - stick to the official sites - DH scared himself silly at one point for no reason.