Hi I have a hard painful lump about the size of a quarter underneath my right nipple. It burns and hurts and swells. I have had it for 2 full days now and it seems to be staying the same maybe orogressing. I am a 16 year old girl, not sexually active, and am 'due' for my period soon but my periods are very unpredictable and can be months late. I also feel hot and fatigued, weary, tired and my body aches. What is wrong with me??