vaginapagina | Treatment methods for dangerously severe PMS

This question is for someone I know. She asked me for my advice today, and I didn't know what to tell her so I'm hoping you ladies can help me out.

My friend has a history of severe cervical dysplasia, and she also has PMS to the point where she becomes completely volatile. She has a mental illness as well, so I'm pretty sure that's what contributes to her homicidal and suicidal ideation prior to menstruating. She's talked to a doctor about it, and it's severe enough that they want to give her hormone treatments. (She's already on anti-depressants but they don't help her since her mental problems are PTSD related and she's still trying to cope with her issues and triggers.) I suggested that perhaps she take an anti-psychotic when she's PMS-ing, since they do seem to be psychotic symptoms. She's going to talk to a psychiatrist about this, if she has the resources to.

My questions are:

1.) Is hormone treatment really necessary? I heard hormone treatments can heighten your risk of cancer, which doesn't seem like a good idea in her case- what with her cervical dysplasia and all. In fact, that's why some doctors won't even put her on estrogen-based birth control (she uses Depo I think) because it might cause her dysplasia to get worse. So, I really don't know how hormone treatment will be any different!
2.) For those who have experienced this type of PMS before (perhaps Premenstrual Dysphoric Disorder?) what did you doctor recommend? What helped you?

I know most of you aren't medical professionals, but I want to give her some information so that next time she sees her doctor she can ask about other options that have worked for women in her similar situation.

Any feedback would be wonderful.