Yes your probably right. Or, just put the milestone event out of mind. It is what it is and it will be what it will be. right? Just can't do it right now.
All you need to do is say when you wake up "I will not file for divorce today". If thats eventually not the case, then you can proceed like that.
I found that I was helped a lot by focusing on the present and not worrying about things that may never come to fruition.