Since I didn't go into a ketoacidic coma last night I woke up this morning. So far no excessive urination and thirst, so I now suspect a too low dose of Metformin to be the culprit of yesterday's woes.
I have lost another 700 grams compared to the weight I measured yesterday morning. Three-quarters of a kilo in a day is too fast, I think. Maybe I should adapt my diet slightly. Nicole thought yesterday's symptoms looked like an Atkins no-carb diet overdose and she might be right. I am not following an Atkins diet, but doing a similar thing with low carbohydrates.
Vincent, on the other hand, thought it might be the penopause (andropause). I don't know where he gets that idea; maybe personal experience? I'm glad to report that everything is still functional ;-)