Hi Estelle, welcome by the way.
I think when our periods are late, we do tend to suffer differently, and different from each other as well... Perhaps check and see how you feel next month and if it is on time.
You could also be low in iron.
Have you changed any medications?
That could also be trying to find its way around your system and make you tired.
Maybe otherwise, you need to see your doctor and get checked over.
Best wishes.
CW