There are many different things that can cause vaginal itching, and the best way to determine what exactly is causing your symptoms right now is to see your primary care doctor
He or she will want to hear more about your symptoms and when they started. If you have recently been on a course of antibiotics, that could put you at risk for a vaginal yeast infection. If you have recently had a new sexual partner and have not been using barrier protection, you could have acquired a sexually transmitted infection. In some women, the balance of normal bacteria in the vagina can also be disrupted leading to an overgrowth of a certain type of bacteria which, although not an infection, can cause some irritation. A pelvic exam and microscopy evaluation of any discharge will be the best way to identify what is causing your discomfort.
Fortunately, all of these things can be treated. A yeast infection can be eliminated with an oral antifungal medication with topical cream to help with the itching. Sexually transmitted infections can be treated with appropriate antibiotics, and bacterial vaginitis can also be eliminated with an oral medication. Book an appointment with your primary care doctor or gynecologist right away. Hopefully you will be feeling better very soon!