Hi. Thanks for your query. Noted the history and understood your concerns. Pain in the bottom of stomach for 2 weeks can obviously not due to menstrual periods or PCOS that is polycystic ovarian syndrome. Probable causes can be as follows: Pelvic inflammatory disease that is PID. Enteritis. Appendicitis and colitis of sigmoid section. Hence I would advise you the following in such a situation: Get a clinical evaluation and examination by a Surgeon or a Gynecologist. Ultrasonography of abdomen and pelvis. X-ray of abdomen in standing position. Tests of blood, stool and urine. All these will give a probable diagnosis and gives plan of management. Till then you can have symptomatic management and supportive therapy like Electrolyte solution.