Suggest Treatment For Missed Periods, Shortness Of Breath, Weight Gain And Fatigue

I haven t had a period in 5 months now--not pregnant, not on birth control and never have been--in addition, I ve had edema mainly in my legs but also throughout my body; chronic fatigue; shortness of breath; weight gain even though dieting (1600 calories a day) and trying to exercise (if not too tired). What could this be? I have seen a doctor and waiting for blood test results but have to wait a few weeks