What could be the reason for the itching and fishy smell in the vagina?

Hello doctor,

I live in a small town, and recently our water has been tested as unsafe and has a lightish brown color. I have noticed this is affecting my skin and hair and making the hair rough. I think it also caused an infection in my vagina, even though I am not sure. Four days ago, I used a dildo in the shower, and once I removed it, my hymen felt irritated as if there was a tear. I thought this was normal since I have not used any penetrative toy after this. But the irritation is still there, and yesterday my period started with a heavy flow. It almost feels like a yeast infection without any itch, Just a sandpaper-like feeling around and in my vaginal opening. I am a virgin, but I use toys, dildos, etc. I was planning on seeing a gynecologist about this. But again, I am not sure if this is serious. My last yeast infection was a year ago. I have been drinking plenty of water since last week to rule out the possibility of a yeast infection. I have noticed my vagina smells fishy. I do not have any medical problems. I am healthy, and I have never seen a gynecologist before.

Thank you.