Darkness therapy works really well for me. Instead of taking artificial melatonin, you're getting your body to produce its own melatonin by blocking blue light in the evening, since blue light suppresses melatonin production. I ended up writing a site about the whole thing here. There are links between shift work/disrupted sleep/insufficient melatonin and various hormonal problems such as breast cancer, by the way. Some articles can be read here. Maybe there's something melatonin-related with you as well, since you report breast problems? I have to say that I still get PMDD after using darkness therapy, so it hasn't magically treated my hormonal problems, but hey, I'm just happy that it's improved my sleep so much. And I'm not you!