Sorry to hear that you were made to feel so awful! I agree with beejaybee, you should report your doctor for being so abrupt. As for the information regarding the possible health effects of diabetes, to a large extent many people manage to control their diabetes very well, and do not suffer such extreme effects.
It's easy to say not to worry, but I would wait for your test results, and if they do come back showing you have diabetes, you can ask to be referred to a dietician, and can also see a diabetes specialist who will advise you and help you to manage this condition.
Good luck!