Hi, I understand your problem. If the odor is so bad and periods are irregular, it most likely indicates an infection or possibly also a cancer. When patients with similar complaints walk into my clinic, the first step is a complete clinical and vaginal examination, cervical and vaginal swabs for culture and microscopic examination, a pap smear and an ultrasound. The next step is a cervical and endometrial biopsy [best is a fractional curettage procedure or a biopsy using hysteroscopy where one can directly see the endometrium]. I also send samples from the endometrium for culture to detect any infection. The procedure is best performed just before you expect a period as it yields maximum possible sample for diagnosis. Both these procedures would help arriving at the cause and further treatment would depend upon the cause. Hope you find this useful. Thanks for using healthcaremagic. Dr. Madhuri Bagde Consultant Obstetrician and Gynecologist