Does My 2 Year Old Have Diabetes ?

Hi my daughter is 2 1/2 years old, recently she has been drinking excessively and constantly waking up soaking wet several times in the night. I am frequently changing her nappy when we are out and when we are at home i am emptying her potty every 10 minutes this has only recently occured and even during the height of the summer when she would be expected to drink more her fluid intake was the same as normal. basically what im asking is does any one out there have diabetic children and do they think this is linked i read that blurred vision is another symptom and she has just got her first pair of glasses. If some one could give me some advice before i take her to the doctors i would be very grateful. thanks dont think im heartless and cruel she has an appointment thursday (the only day i could get her in!!) i would like some advise and knowledge before i take her from any one that has possibly experienced the same thing im not delaying taking her-just to set the record straight for the brain surgery response person!!