I wonder I am sick?

I feel very cold lately. My whole body ache. I had to hide under the blanket. I closed all the window. But I still feel cold. I thought the weather is cold outside. I thought it is normal that my whole body ache at this time. I thought that I am dizzy as I do not have enough sleep.

But today, I saw many children were playing in the playground outdoor. Some even wearing singlet. Today is sunny day. But I still feel cold and the ache still never less though I had the pain killer. I just realised that my forehead are a bit warm and my feet and hands are cold. My head is heavy as well. I am wearing 3 layers of cloths and sweater even socks but I still feel cold. I think I am having fever liao...