What's this pain mean???infection?

So for a few days I've had a wierd smell from my vagina and it's been itchy and irritated.I've had some wierd pain that will come for a second then leave but its not constant it's almost like the pain is a blinking light (it's there then not then back all in a few seconds ? Some white discharge but thinking that's just ovulation? I've never ever had this pain before...it started after I came back from my boyfriends house we always have sex without condoms and have for 3 years and this has never happened? We only had sex once while I was down at his house.Also slight hot feeling when I sit almost like my vagina is falling asleap sort of but its my butt hole as well ? We didn't do anal