One of the most usual suspects in the foul-vaginal-odor sweepstakes is BV, or bacterial vaginosis. It takes antibiotics to get rid of it, don't waste your time douching. Drop by your ob-gyn and get swabbed to test for BV, and take your pills if that's what it is. Don't let it go, as BV can cause pelvic inflammatory disease. It's no big sweat, but you do need to see the doctor.
skip the douch you could spread germs up higher, I agree, it's time to call the doc.