HELP ME.

Ok say, after every period I catch a yeast infection (or so I think). My vag smells chemically sometimes and other time it’s fishy. My discharge is like clear then white then yellowish. I’m thinking this is is not j a yeast infection. maybe it’s BV or Trichomoniasis. My should I j go to the doc or what? And last week my vagina lips got very irritated and got really raw for a day until I used some monistat. I’m really scared cause It’s been going on for a lil minute and I’m scareddddd!!!!