I have been having severe periods (serious pain, very heavy bleeding, and long lasting). They also are irregular, meaning I may stop for days and then start again with another long, heavy cycle. My doctor gave me Rx for Lysteda but I am afraid to start it after reading the educational info given by the drugstore. I mean, I want relief, but not at the risk of blood clots or strokes or death. I ve been trying to overcome a breast cancer diagnosis and dont want to take a risk of serious harm from this. Any suggestions? Also, I noticed that it said something about not taking if you had a previous endometriosis diagnosis. I did in 1992, but had surgery for it then. Even though it was a different doctor then, I still see someone in the same same group now. That info should be in the records. Should I call and see if he saw that?