Hey Avi, sorry I've only just stumbled upon this.
Okay, chocolate is good when you are PMSing but once you get your period its a no-no. Avoid stuff that will bloat you like salt, dairy, sugar, etc. Gentle exercise is good for the cramps, but of course you have to feel up to doing it. Heat pads are very good for easing the cramps, as well as a hot bath. Basically, menstrual cramps are just milder forms of birth contractions, because you are actually dilating your cervix slightly (I had what felt like really severe menstrual cramps when I miscarried). So whatever women do to help during labour may help. If you are really suffering and desperate for relief, you could even try a TENS machine.
Hope this has helped.