Abdominal pain, vomting, increased frequency
of stools can be due to number
of causes. Viral
gastroenteritis, stomach flu, food poisoning. Irregular periods, brown discharge during periods can be due to number of causes. Pelvic inflammatory diseases, hormonal imbalances all can lead to these symptoms. Drink plenty of water and fluids to avoid dehydration. You should go to the doctor again and get yourself evaluated.