If your cholesterol is still high, you should avoid the fatty food (though as far as I know, the Greek diet is
high in unsaturated fat like olive oil?). If
cholesterol levels are still
high, you should talk to your doctor about medical treatment.
Take the tests at 9.00 AM and avoid eating after 9.00 PM (a.k.a 21.00 European time). Not difficult at all :)
Keep in mind, this is no acute danger, but find out if your cholesterol really is high, and if it is, do something about it.