yeast infection in coLLeGe

hey guys

so i’ve been in college for 3 weeks now and i seem to have a yeast infection once again. i get them often when i have sex with new people (which i did with one guy recently) and now i have a yeast infection. im living on campus with no car and there’s nowhere near me i could get monistat or anything to fix my yeast infection so what should i do? and also does anyone know why i continue to get them after sex? or how to prevent them from occurring? thanks