Herpes or yeast

havent had some thing like this happen in a long while over ayear and ahalf i had 3 sex partners at the time at was dealing with multiple yeast infections i always wore tight clothing undergarments i got a disper rash looking thing then i read that i could make douche water w vinegar pink salt perxocide and dilute with water it would burn severely of ofcourse but then it got so bad i saw sores they look like herpes i got tested for stds months later it came back negative everything never got the sores swabbed or anytging one of my partners also start itching it also coukd of been from wearing tight underwear . im not sure if this develope from the douche i made or wgat i havent seen sores sonce i stopped douching but that coukd of just been the first outbreak does anyone know what this is ?? im curious if its just yeast sores or hsv