My digestive system always seems to go haywire during my period - not before, but during. this month it's acid reflux. why is that & how can i fix it?

GI problem: period: One association of one's menstrual period with "digestive problems" is with endometriosis, which is the proliferation of implants of uterine lining cellular material into the abdomen. Seeding of the intestines (usually the colon) can start hypermotility leading to diarrhea and attendant "digestive disorders" at the time of menses. Oral bcp's can greatly reduce these symptoms.