Thanks for asking your question. I'm not a doctor, so I cannot give you medical advice, but I do have herpes and I think I can help you.
There is no way for me, or anyone, to diagnose you online or over the phone. You should go see a doctor, who will probably be able to take one look and immediately tell you what you have. The sooner you go, the better. It will be very easy to get a diagnosis and treatment, if you go while you still have symptoms.
That said, from what you describe it sounds to me like you have a bad yeast infection. Herpes blisters can be on the inside of the vagina, but they're usually on the outside and in a localized spot. Herpes causes itchiness, but just in one area, usually not all over. Either way, the doctor will be able to give you medicine to get rid of it and you will feel so much better. So don't worry, just go soon! If you can't get an appointment soon, or don't have health insurance, I recommend calling your local Planned Parenthood. With the symptoms you describe, they should be able to get you an appointment pretty soon.
You should check out a SharePost I wrote recently comparing herpes outbreaks and yeast infections called Genital Herpes and Yeast Infections. You may find some similarities to what I describe, and, although it doesn't substitute a doctor's visit, it may put your mind at ease a bit more. I also recommend you look at the Herpes Symptoms page which has a number of different resources.
Good luck and please come back and let us know how the doctor's visit went.