ONE OF THE MOST frustrating things about premenstrual syndrome is how it can throw you off balance psychologically. You confused, even depressed, but you’re not quite sure why. though a dark cloud hangs over you. You tell yourself it’s your your family, your finances—and that very well may be the case, there’s something more that you just can’t put your finger on. suddenly, you get your period and the skies miraculously clear. to PMS.