One of my (highly respected) work colleagues had one of these events - the same day as he passed his Class 1 medical assessment. The diagnostic process was identical to the way Radgirl explained it. Unfortunately he has lost his Class 1 medical certificate for 12 months & pending no more re-occurrences, he should get it back albeit with must fly with another pilot on board which won't be an issue for him. He was told the chances of a re-occurrence are extremely slim.
Good luck...
VH-MLE