What To Do For Cramps, Nausea, Bloating And Heartburn During Periods?

I am 22 years old and the mother of a one and a half year old son. In May I came off of birth control. On June 14th I had my period. I have always had very regular cycles, between 28 and 30 days in length. It is now July 28th, and I have mild cramping, nausea, heartburn, bloating, lightheadedness and an increase in appetite along with some cravings and smell aversions, yet have had a few negative hpt test results. What should I do now?