The usual antibiotic recommendations are metronidazole, tinidazole and clindamycin. Read here;
So, unless the bacteria are sensitive to this antibiotic also, unlikely to treat it.
I would say no, to use these medications as they would be ineffective.
Health diet always increases your immunity so good diet which includes yogurt will help you. Douching is contraindicated and not recommended.
See, it is a bacterial infection, so an appropriate antibiotic can only take care of it. As a matter of fact, we are not even sure of the diagnosis as it is not done by a physician. So if you are exposed to unsafe sex, please go to a STD clinic. You can find in your area some physicians or services which are subsidized or almost free for physical examination.