Suggest Treatment For Itchy And Swollen Vagina After Intercourse

I am 35 years old, married, female. i have an itchy, swollen clitoris. we just had sex a few days ago. I do not remember having such a swollen clitoris before. A few times i did get itchy clitoris, maybe it was due to some infection, but this time i find that it is very much swollen. when i walk, i can feel it between my legs and it feels like its aroused and erect. Is it due to the sex or due to an infection? It is very painful at times. i found my underwear moist twice but i cannot say if there was a discharge or it was moist because i was rubbing the clitoris when it was itchy. Thank you.