As I posted in the last message a great book ot read is what your doctor may not tell you about premenopause...I ahve had many problems since I started my period and finally things are getting inot order...the book talks much about how endometriosis is very much related to too little progesterone. a common problem in our unhealthy environment with may xenoestrogens mimicking real estrogen causing an imbalance. Xenoestrogens are found in pesticides, plastics, and fumes from cars etc.