When I would get cramps I noticed that cold drinks and foods and chocolate increased cramps. Pay attention to see if any food or drinks increase your cramps. The uterus is contracting in order to shed itself and you get pain when the uterus contracts too hard and, therefore, decreases blood flow in the uterine blood vessels. This is why heat helps because heat causes vasodilation and increased blood flow in the uterine blood vessels. This is also why exercise helps too and sex/orgasm. Masturbation can work too. And drinking water increases blood flow to the uterine blood vessels.