I'm 13 and I'm having backpains for about 30 hours already, at first it was like my back feels heavy at the lower middle part and then recently I have felt some pain at the right side also. The pain can be felt whenever I moved slightly and for comfort it seems like it wanted some stretch or bending and laying down. I'm not sure if it was caused by my sleeping positions, exercise, or whatever. What could it be and what caused it?