Licorice (but don't have it if your blood pressure is high).<br />
OTC medicine called pamprin<br />
painkillers such as motrin and tylenol<br />
weeping and writing sad poetry
If you are in the UK, they have the best black licorice - the soft, stretchy kind that comes in coils. You can also get it in supplement form if you live in a city that has a health food store.
Pamprin is a sort of painkiller, I forget what's in it. The British people probably have their own good stuff for PMT if you ask at the nearest pharmacy. A lot of their OTC medicines are cheaper too.