A few days i notice that my sister in law use one of my razors few so i use my other one and idk if she used both but now i have vagina infection it can be for the toilet paper or many more things or it can be because i use that razors.

Weeks before that she went to the doctor and her mom ask what for she said it was for a headache well i check her medicine and it was something for vagina, now i have a bad smell (sorry to said that maybe cqn sound disgusting) this never happened to me before now i have a bad smell, itch and sometimes it burns. Any recommendations any cream or something?

Update: thanks for helping pls i dont need GIFS since this is serious...