Yeast infection medication

So at 27, I recently got my first yeast infection, my PH levels were way off so the Dr. said it was a bit different than just the normal yeast infection called BV. She gave me a prescription to take for 7 days, everything cleared up just fine but only for a few days. I trace my started having yeast infection symptoms again, mind you I've only been cleared up maybe a week or so if that.