I'd bring the issue up next session, wouldn't ask his "permission" or if he wants to discuss it, etc.; he's "working" for you and should be working on what you want to work on? I'm sorry you didn't think of it until after you made the appointment for further down the pike. I think like Sky says though that it's mostly just disjoined circumstances as to why you all haven't connected when you've needed to.

I don't know; if he seems less than thrilled with discussing the issue I'd maybe hire someone else for a few sessions to discuss it with them, especially if it is not about the divorce/others but "your" issue.