Hello, Thanks for trusting us with your health concern. All sorts of abnormal menstrual pattern is observed as the hormone production dwindles towards menopause. From the description you have given, it appears that you are shedding endometrial casts along with old altered blood. If the odor is like a fishy smell or that of rotten eggs, infection should be suspected and investigated. I would suggest a routine gynecological assessment along with a pap smear, blood counts, urinalysis and a sonogram of the pelvis in the trans-vaginal route to plan further management. Hope this helps.