My 18 year old daughter who is away at college and has poly cystic ovarian syndrome (with erratic menstrual cycle) and insulin resistant hypoglycemia, felt the start of menstrual cramps and in a very short period of time the pain from the cramps became so severe with fever, sweating, nausea, vomiting and some difficulty making herself clear to her friends who were with her. I believe she was trying to ask them to take her to the hospital/ should she go to the hospital (her cell phone was breaking up). She also felt pain in her lower back when she lay on her back and felt pain in her abdomen when she lay on her stomach. Within approximately a half hour the pain subsided and she felt better. She was tired so she rested/ napped. I ve spoken to her again and she feels fine with slight menstrual cramps. Her menstrual flow is normal. What might this be? Also, she had a similar event but not as severe a couple of years ago. Symptoms By Mayo Clinic Staff A kidney stone may not cause symptoms until it moves around within your kidney or passes into your ureter — the tube connecting the kidney and bladder. At that point, you may experience these signs and symptoms: Severe pain in the side and back, below the ribs Pain that spreads to the lower abdomen and groin Pain that comes in waves and fluctuates in intensity Pain on urination Pink, red or brown urine Cloudy or foul-smelling urine Nausea and vomiting Persistent need to urinate Urinating more often than usual Fever and chills if an infection is present Urinating small amounts of urine Pain caused by a kidney stone may change — for instance, shifting to a different location or increasing in intensity — as the stone moves through your urinary tract. When to see a doctor Make an appointment with your doctor if you have any signs and symptoms that worry you. Seek immediate medical attention if you experience: Pain so severe that you can t sit still or find a comfortable position Pain accompanied by nausea and vomiting Pain accompanied by fever and chills Blood in your urine Difficulty passing urine.