This is purely my opinion, but this seems almost like a manufactured controversy. PMDD affects 1.3% of the population, and the only reason this seems to be getting the limelight is because, as quoted below:
"I think any time a disorder occurs more frequently in women or only in women, there's going to be a group of individuals who have concern that this will diminish women's role in society, their sense of being capable," Epperson says.
The way I look at it, we should absolutely aspire for as much an equal and fair society as possible, but we should also have the sensibility to know that different ailments and conditions can affect men and women, simply due to differences in biology. As much as we would like men and women to be identical for the purposes of a fair society, sometimes we just have to acknowledge that there are some differences, and accept that it is not always an ethics question.
There are conditions that affect men more than women, as well.