Then I went on anti depressants. They took away the dysphoric lows that sexist casual observers would often misinterpret as PMS. (Until those dysphoric periods got ragingly out of control, then the casual observers just worried about me.)
But the hormone fluctuations during the week I take the sugar pills interfere with the way my anti depressants work.
The result: something for all intents and purposes that manifests itself as PMS.
Isn't neuroscience ironic? ;-)