HELP! HOW TO PREVENT VAGINAL ODOR

I'm VERY self conscious of my vaginal odor. It has become so strong that I carry a travel size vagisil in my purse in case I need to do a quick freshen up before sex. I don't want to have to worry about it anymore. I've been using vagisil, Phresh pills, and switch to cotton underwear. What are the chances of this being more of a health concern? What could this possibly be?? Any treatments???? HELP :((((

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UPDATE:

It could be BV. What antibiotics could I buy for it? Over the counter or prescription? Is it normal?