There are 101 ways to experience PMS, and 101 ways to deal with it. This review is just going to mention a few of those options.
First of all, make sure something else isn't going on. A 1985 study found that a whopping 75% of women who sought medical help for PMS had something else going on that made their symptoms worse, mostly depression, but also eating disorders, substance abuse, etc.
Perhaps your best option with PMS is exercise, exercise, exercise! Study after study shows that women who get regular aerobic exercise have significantly less fewer PMS symptoms.
Vitamin B6 can be very useful, both in terms of the emotional symptoms, but also with water retention. (Author's note: I know this sounds kind of fruity, but if you don't remember your dreams, it often indicates you could use a little extra B6).
There is some evidence that many PMS symptoms can be traced to "estrogen dominance," the situation when the body does not have enough of the hormone progesterone to counterbalance estrogen levels. The herb chaste tree berry (Vitex agnus-castus) instructs the body to produce more progesterone; progesterone cream supplies bio-identical progesterone which absorbs through the skin straight into the bloodstream. To read more about estrogen dominance and progesterone cream, the books of John Lee, M.D. are highly recommended.
GLA-rich oils such as evening primrose may also be helpful, along with magnesium. And while they don't address PMS directly, diuretics (for water retention) and calmatives (for not feeling especially calm!) can often be invaluable. These should work rather quickly; most PMS supplements, on the other hand, need to be taken for 2-3 cycles.
.....more about PMS and Cramping.