I know this one very well. When you work yourself too hard, your body will ask nicely for you to rest for a while and then one day, it gets mad and makes you sit still. Usually while calling you nasty names. It's really important to manage your energy and know the signs that you're starting to run on fumes. I'm getting better at recognizing when I have to slow down and pay more attention to the signs that tell me that I need to stop right now this very instant. Still, sometimes it's not possible and then comes the crash. It sounds as if that's what happened to you. Still, if this is unusual for you, you may want to talk to your doctor about having some tests, just to check that everything's all right. Look at your iron, your vitamin B and D levels, etc.

And speaking of vitamin B… You may also consider looking into finding a licensed doctor of naturopathic medicine. They can be very helpful in terms of getting your general health to a better level. Last fall, I had a period of deep fatigue and spoke to my naturopath about it. She told me that one of the first things naturopaths do when their patients complain of fatigue is a give them B12 shots. I had it tested with my family doctor and according to Western/allopathic medicine, my B12 are within normal range. However, from a naturopath's point of view, they were probably a bit low. I now get B12 shots every two weeks and it helps tremendously.