My girlfriend is experiencing extreme pain in her stomach and in her back. It is an all-over pain in her midsection. She is being stubborn about seeking medical advice. She had diarrhea all day, and it finally stopped when she took two Imodium. After a while, her pains returned and she is now in the bathroom screaming in pain. I have no idea what to do. She has had diarrhea since yesterday morning. She is 26 and 120 lbs, non-smoker, active, with no known food allergies.