I am 32 y/o female 5'7", 150lbs, 2 children and happily married. I do not take any medication or BC pills. I have minimal stress. (many blessings!)My problem: Every month approx one week prior to onset of my period...I experience horrible foul smelling flatulence. It is embarrasing and needless to say hard to ignore. 3-4x times a year it is accompanied by severe and sudden onset diarrhea, migraine, and other common PMS symptoms. In researching this topic, I find much on PMS symptoms and treatment...but little mention of this particular problem other than "IBS" or "bowel changes". I do not have mood swings (even husband agrees) but, I am often more tired, clumsy-(I drop things), stutter, and have uncomfortable back pain DURING my period. What is causing this smell? I am not kidding when I say it is THE foulest odor you can imagine and for 3-4 days of the 1 week it is frequent. Obviously, I try to "hold it in" if in room with others and it is not explosive but, it is so foul I even wake up in the middle of the night because the smell has woken me. I have what I would consider "normal" gas normally. Please help...I want to know the specific physiologic reason it occurs and what I can do about it. Thank you.