What Causes Lower Abdomen Pain And Spotting Between Periods?

have pain on my left lower abdomen, have had spotting between periods, swelling and it seems weitht gain. tenderness around the area. was told after an ultrasound that a cyst had burst. i still have pain, feel nausous, sometimes diarrhea, and sometimes feel constipated. any ideas or insight. regarding the cyst, myself and 2 girls at work have been diagnosed with cysts in past 2 weeks