It sounds like the beginning of a bacterial infection. The vagina maintains a delicate balance of good and bad bacteria to naturally fight infections, but can sometimes go off balance resulting in an infection. You could try an OTC vaginal suppository like Monistat, however if the symptoms don't clear up after the home treatment, its time to call your doctor or visit a clinic. Hope you find relief soon!
It's definitely some sort of bacterial infection. My advice to you is call your DR ASAP and get checked out before the symptoms get any worse. Good luck!