I don't really have an answer for you, but I have the same problem and have just recently been diagnosed with a possible hormone imbalance. I go for testing tomorrow which will tell alot about my pituitary gland (which secretes all of puberty and pregnancy hormones) and my thyroid, etc. I went to the doctor initially for my nipple is secreting green discharge and is sore. I'm sure after my own research that the two are connected. I will know more in a few days. The pituitary gland also has been proven to overact due to stress ( I have alot right now).