I keep getting a bacterial infection but test negative for std's. my gyn has given me two different antibiotics but it keeps coming back?

Flora: Sometimes women have changes in their vaginal flora that having nothing to do with an std. This is a bummer when it happens, but there are treatments. You may want to consider using some probiotics, a product like luvena. A great book on the subject is the v book (you can find used on amazon for $5). Also good is to think about what may be causing these infections? I.E. Changes in your body?