It sounds like you are experiencing the occasional vaginal infection
. These types of infections are common. Basically they can be divided into three different types, though others are possible.
1. Vaginal Candidiasis - This is your typical yeast infection. It occurs when the yeast Candida Albicans overgrows in the vagina because of antibiotics or diabetes, or sometimes for no reason at all. Symptoms are typically vaginal itching and redness with a white cottage cheese like discharge.
2. Bacterial Vaginosis - This is an overgrowth of the natural vaginal bacteria Gardnerella Vaginalis. It is not clear why this infection occurs, but sexual activity is sometimes associated as well as douching. The symptoms are vaginal itching, and discharge with a fishy like odor.
3. Trichomoniasis - This is an infection with the parasite Trichomonas Vaginalis. This is the one vaginal infection which can be sexually transmitted and sexual partners of those infected need to be treated as well. Signs and symptoms of the infection are similar to Bacterial Vaginosis.
I suggest that you schedule an appointment with your primary care physician
or OBGYN, whoever you see for your feminine health. He or she can perform a pelvic exam and take a look at the discharge closely and determine what type of infection this is. From there you can get the right treatment.