I had a sandwich and a diet coke at about 12.20, at 3 o'clock I tested my blood sugar on a friends monitor and it was 10.8. Am I right in thinking that's quite high? Is it likely to be diabetes or does something else raise it? Or could it just be normal after having a coke a few hours before? A bit worried as I have been weeing a lot lately... But no other symptoms of anything!