I went through a nasty re-occuring BV infection years back, the med's would clear it up (don't remember what it was but it ended in -zole and you couldn't drink alcohol when taking it)  but it kept coming back.  Both me and my man got tested and were clear so my doctor told me sometimes certain people's body chemistries (ph of the sperm/vagina I think) don't react well and can trigger an overgrowth of bacteria (i.e. BV).  We started using condoms and it completely went away.  Idk, just another perspective.  Oh, and my doctor told me to 'save the thongs for the weekend' lol. Hope you get it cleared up, any issues 'down there' can really freak you out, good luck.