help!!!

so the past 2 months i’ve had a weirder than normal color discharge went to the doctor for it and was told everything was normal but when i had sex it burned and when i went peed after it burned. went back got tested for chlamydia and gonorrhea both came back negative. now the symptoms are pain during sex and after when peeing, itchiness and red/irritation only near the vaginal opening. went back to the doctors and they treated me for trichomoniasis even tho my test never came back positive and then also treated me for a uti. After ALL that i’m still having itchiness, redness, and burning sensation while having sex and after while urinating. Does anyone at all have any suggestion or ideas as to what this is because doctors are not helping.