Yesterday I was fine, then my back began to hurt, then my body. As soon as I got home, I felt a headache, very tired and then some nauseas. Now the next day, here I am, I called off work, my son to daycare, because I just don't feel well. My nose is not runny, I am not sneezing. All it is, my back hurts, I am sleepy ( I have been sleeping all day), and I have not eaten a lot, because I feel like I will throw it up. I also feel weak. I could barely pick my 23 lbs 11 month old. Help me? What is this?