Suggest Treatment For Vaginal Itching

Awful vaginal itching like that of the pregnancy rash I had when I was carry my now 3 year old. Have itching every month before I start my monthly. Last month was bad but wouldnt go away until I took antibiotics for strep throat. I noticed it stopped. Now it is worse and have to keep using vaginal anti-itch cream nonstop or it will itch horriable.