I currently have endometriosis and have been given the run around with various hormonal treatments and pain medication. Neither work anymore. I have been given cocodamol, codeine, tramadol and fentanyl of all things. My doctors say there is nothing else I'm allowed. I'm sorry but I find it hard to believe there are only 4 medications available with serious gaps in strength. Fentanyl is far to strong for me and the pain is Bad but it's not that Bad.