"They will bounce back."
I think they were lucky you came when you did.
If your blood sugar level tops 600 milligrams per deciliter (mg/dL), or 33.3 millimoles per liter (mmol/L), the condition is known as diabetic hyperosmolar syndrome.
When your blood sugar gets this high, your blood becomes thick and syrupy. The excess sugar passes from your blood into your urine, which triggers a filtering process that draws tremendous amounts of fluid from your body.
Left untreated, diabetic hyperosmolar syndrome can cause life-threatening dehydration and a diabetic coma. Diabetic hyperosmolar syndrome is most common in middle-aged and older adults who have type 2 diabetes.
http://www.mayoclinic.org/diseases-conditions/diabetic-coma/basics/causes/con-20025691