I have been having this fishy smell coming from my vagina for about 3 months now. 2 cultures detected only a yeast infection but I still smell fishy?

I would ask. Specifically for metronizadole 500 mg 2x per day for 7 days. You don't need a culture to diagnose that one, it's bacterial vaginosis and sometimes you have to treat the obvious, not depend on a culture. Gd luck.