Dry before period

So this has been happening for two months now. 
About a week before my period comes on my V is dry and slightly irritated. I've been using Vagisil for the irritation but it doesn't go away until AF comes along. Then it's like it never happened. 
Has anyone experienced this or knows what's going on?
Note: the labor minors bleeds slightly when I don't put Vagisil on it