I had sex with my bf for the first time and then and a week later i felt the razor blade pain and then About 3 weeks ago I was experiencing signs of a yeast infection and then a couple of days later I started my period. Well on the third day of my cycle I went to my friends house and forgot to bring tampons.. (This may sound gross) so the tampon was just sitting there and when I got home the razor blade pain was almost to much to bare. So I ask my mom what it could be and she said it might be a blader infection so I go and buy AZO and the pain still hasn't gone away. What should I do?