curiousss?

so last month i had sex with a condom(which i forgot i was allergic too..) and i’ve been having symptoms of sharp itching sensations in my vagina and outside my vulva it used to be really bad but now it’s has calmed down and i have discharges (it doesn’t smell) but every day i get an intense itch that last like 15 seconds .. i went to the primary care provider and they tested me and i was negative for bv, yeast infection, trich, gonorrhea, and chlamydia and i also took a ph test available over the counter and it came out normal what could it be ? if it’s allergic reaction why is it lasting this long what creams can i use inside to stop the itching ? this is so annoying ! if i tested negative for all of that it’s weird that i’m having symptoms.