hi,
i don;t know if this will help but my doctor has inserted a mirena device and also put me on primolut tablets. This stops me from having a period which is ok and it is amazing as the pain is nowhere near as bad as it used to be. I've now had the mirena for just over a year and it lasts for five years. It is a newer type of treatment and is meant to help and try to fight the endometriosis getting worse, hope you find something that helps you. Good luck!