Hello and welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Your symptoms could be due to indigestion and gastroenteritis. The most common source of infection is the ingestion of contaminated foods. Toxins due to infection trigger the release of water, which the body tries to push out of the system as quickly as possible to rid itself of the infection. The toxins generally produce the dark color, while the extra water causes the loose structure of the stool. I would suggest to consult primary care physician and undergo stool examination if needed. You can take following prescribed medicine: - Tablet gas x for gas - Tablet ofloxacin plus ordinazole - Tablet dicyclomine - Capsule sporolac Soluble fiber supplements like senna Eat diet like banana, boiled rice, applesauce, yogurt, buttermilk and toast. Drink plenty of warm water and maintain proper hygiene. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Sagar