Use treatment every day, it's the only way to get on top of it.
I use Vagifem and a smear of estriol on the outside daily, when I have a flare up I use 2 Vagifem until it calms down.
You don't say how old you are but I buy a back up supply of Vagifem for such occasions, I don't ask for more from my surgery because it just causes aggro, I don't need that in my life.
You have to be over 50 to buy it, Boots do Estriol cream called Ovesse. It's a condition that you can take control of yourself.