Hi,
Welcome to the ehealthforum. I am glad to help you out. In view of the symptoms which you have descried, please consult a gynaecologist & get checked for bacterial vaginosis. It is the most common cause of abnormal vaginal odour and discharge. It is caused by a change in the type of bacteria found in the vagina and produces a fishy odour which is sickening.
In addition to unpleasant "fishy" vaginal odour, thin white or yellowish discharge from vagina may also be present. Diagnosis can be confirmed after pelvic examination and microscopic examination of the vaginal discharge. Treatment is by metronidazole and clindamycin.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care.