Body Pain During And After Menstrual Cycle

Hi, in june I started getting pain all over my body. The pain was shooting all over including my abdomen. It started right before my period and was worst during the heaviest time. Then slowly afterwards began to subside each day until a week later it stopped. Exactly a month later it happened again except this time it was not as bad, but I have notice tingling in my feet and hands as well as muscle spasm which I have never notice before. I have not seen a doctor yet but have an appointment to see one next week. The pain has subsided just like the last time, but I still feel a little bit. I waiting to see if it completely stops like it did the last time. June of 2007 was the first time I have expericed this time of pain around my menstrual period. Has anyone ever experienced this before or knows someone who has. I have been thinking the worst, like its the beginning of some type of immune disease or something.