My big crash

Ok, so we knew it was coming. I woke up yesterday morning and felt like I'd been hit by a bus. I know that you can only run your body on fumes for so long before it decides not to work anymore so I decided to give in to it and went back to bed. Today I stayed in bed for much of the day and only got up when I really had to. Just walking from one end of the house to the other wore me out! I feel absolutely drained ...