Last night, after waking up from my short nap, I had a sudden, painful and aching body. Just a simple breathing, made my whole body excruciatingly painful. It was unbearable. I had to take in short breaths at a time and lay down still to control the pain. Then, fever came and immediately took two Panadol. What causes these sudden attacks? Now, much of the pain has subside but there is still pain when I breathe deeply. Your prompt answer is much appreciated. Thank you.