Diabetes

Patient: Hi, my name is Gemma, I’m 18 and lately I have been feeling very tired all the time regardless of how much sleep I get. Also I have to go to the toilet often throughout the day, but when I do not a lot comes out. I also experience quite bad crashes when I have caffeine: I get extremely tired very quickly, sometimes get quite emotional and feel sick. Is it possible I have diabetes, or am I overreacting? Thanks

Doctor: