Constipation/diarrhea both with some mucus only before period?? am i sick??

No, you are not sick: Alternating constipation and diarrhea with mucus production is most consistent with an irritable bowel syndrome.The flare ups in the premenstrual phase are likely produced by excess production of prostaglandins, which is physiologic. Understanding the cause and decreasing any anxiety that you may have about these symptoms, and in general, goes a long way to get the problem to settle down.