The pre-diagnosed diabetes vicious circle. If it’s anything like Type II: blood sugar rises -> thirst -> drink more (possibly sugar drinks) -> interrupted sleep due to bathroom breaks -> tiredness and generally feeling bad.
Unquenchable thirst and chronic lethargy are classic symptoms of diabetes. What kind of irresponsible GP wouldn’t query diabetes and order bloodtests to screen for it?
Its actually much worse and sometimes fatal. Ketoacidosis, vomiting,extreme pain, cerebral swelling, shortness of breath.