I don't have many suggestions, but suffered from the mood swings tremendously after having children - so if it's any consolation, you are definitely not alone!! I never had any cramps or headaches or other physical PMS symptoms, but boy I was such a witch....just got so bent-out-of-shape mad about everything the week before. I don't have that problem anymore, but it's been replaced by lots of other neat things like hot flashes and a chin hair here and there....LOL
I think the B vitamins help alot and don't have any nasty side effects, so worth a shot. The other thing that I found helpful is to enlist the help of husband and kids...have them call me on the behavioral stuff...try to nip it in the bud.
cj/