Hi, Thanks for writing in. In my opinion, the symptoms that you are having just before your period comes can be due to a pre-menstrual syndrome. This can effectively be relieved by an OTC pain killer like ibuprofen. You can take Tablet Motrin 1 tablet 2-3 times a day with food. also, remember to keep yourself well hydrated and have small regular meals. However, the green stools cannot be attributed to this and can be due to a variety of reasons like laxative abuse, inflammatory bowel disease, irritable bowel syndrome, malabsorption and bacterial overgrowth. Please see your primary physician for this. If its required, the workup can include a consult with a gastroenterologist. Hope this helps Regards