What is wrong with my ?

have you told your doctor about the nipple discharge? this isn't normal, though it doesn't necessarily mean that its caused by something serious(see link below). It sounds like what you've hurt is the muscle under your since it hurts in your armpit. what side do you sleep on? I usually sleep on my stomach, so when I sleep on my side one of my will hurt pretty severely from fighting gravity all night. have you looked at your bra? maybe you have something wrong with 1 side of it. I dont think that this is cancer, as cancer shouldnt be painful, but anyways there is a self exam guide listed below.