I've been itching and burning down by my vulva area. I assumed it was a yeast infection and used 3-day Monistat with cream but I'm still itchy.?

Infection. You need to see a doctor, it maybe a different type of infection.
Bacterial Shift. Sometimes a bacterial shift/vaginosis can mimic a yeast infection. Id get a full check up with your doctor as this is easily diagnosed and treated once they see you.
Bacterial. You could have a bacterial vaginal infection that can cause similar symptoms. Another possibility is an allergic reaction . See your doctor or urgent care for exam and testing.