Leslie- I will not nor will I ever douche. It messes with all the good normal stuff that is suppose to be there. I don't know your age, what it smells like? So I'm guessing your normal vaginal flora has been disturbed some how. Lubricants that are sweet are notorious for this, too much douching can also cause this, age related problems(incontinence), weight gain, synthetic fibers(panthose, nylon panties)(I always cut the crotch out of pantyhose when I must wear them)
The only douche vinegar and water for cleansing, if you must. Then if it itches try some yogurt to re-establish healthy flora. Eat it, drink it. I've heard of people using it as a vaginal suppository in capsules for yeast infections. Just remeber live cultured yogurt, it will say on the label somewhere.
I have had this problem and it went away with cotton undergarments. Sleeping in the nude. We need ventilation down there. (never blow air in there! can cause death from air embolus) In case anyone misunderstood, ventilation is different than blowing.
I would do as little as possible. I would go to a Dr. for a diagnosis. Then look for that on the internet. I know of no natural cures for the many one celled amoebas we can get. All of them would cause an odor. Usually a dirty dish rag odor that has sat on the sink too long, some say fishy, I have never smelled fish down there on me or anyone else.
Hope this helps