DO NOT make this about your anniversary week, or anything like that. BAD IDEA. If you do want to go on a trip alone, then do it. Pick a date, plan it, do it. But DO NOT wallow in self-pity because of some stupid date on a calendar, and do not pin any hopes on the idea that you will reconcile magically for your anniversary.
My guess is that if he "always" took vacation around your anniversary, it was only because you "always" wanted him to. There is no way he will see this as anything but more needy behavior from you, and it will turn him OFF.
Tell him you would like for him to watch the kids sometime so that you can go on a trip. Ask him if he would be willing, IN GENERAL, to use some of his vacation for this purpose.
If he says no, then say you'll make other arrangements. If he says yes, ask him if there are any specific dates that would or would not work. If he says "it depends" then tell him you will get some specific dates in mind and ask again. But not October.
