Hiya Bed,
I wouldn't think that craving sugar is a symptom of diabetes, but if you're really worried, get tested as the others have said. Both my daughters are diabetic. Neither of them craved sugar before they were diagnosed, but they did wee a LOT and drink a LOT (8 x 250ml bottles of water during school for eg, and still feeling thirsty; going for a wee every 10 mins, waking in the night several times to wee, wetting the bed). They were also very tired and lacking in energy.
If you have these symptoms, see a dr this weekend. If not perhaps get a test just to put your mind at rest?
Let us know how you get on.
Sue