I had that problem when I was overweight so if that is a problem for you I would suggest losing some weight. Other than that yea you could have an infection so I would go to the doctor. I wouldn't insert anything foreign into the vagina just go get checked. Good Luck BB
Yes, soaking in warm water would be good. One thing I would recommend is to Not keep scrubbing and scrubbing with soap, it will make the problem worse instead of better. Assuming you can get to the doctor within a few days, soak in warm water and maybe cleanse yourself with just a very mild soap once a day. I'm not sure about the vinegar...
It could be just a yeast infection, call your doctor and make an appointment and good luck to you :)