So I've had sex with one person and that's my ex .. he only had sex with me . And 2 years ago. I got this really bad yeast infection. now everytime I'm about to be on my period I get the same feeling . now it itches really really bad and burns when I pee because I scratched . I douched before it got bad and it got worst . it burns when I pee & I'm scared it may be a std :'(