Kinda need help please

So me and my boyfriend have been having a lot of sex here lately. I do mean the weekend 2 times a day then Monday and Tuesday once a day. Our sex drive went wild lol. Well the last two times we had sex I started to hurt down there, then it went to a itchy then to burning also. So I looked it up, and came back as a yeast infection is what I do believe I have now,😔 What would be the cheapest most easy, and fast way to get rid of one? Please help, I looked it up and saw something about yogurt