I never really had a set therapy schedule, so we scheduled as I needed. In times when things were on an even keel, I might spread sessions out a bit.

But, if seeing your therapist weekly is helping you stay grounded, then just tell him that you'd like, at least for now, to keep the same schedule.

If the concern is that you don't have anything to work on, perhaps the issue that he's providing that something you can't get elsewhere is something to discuss. What can you do in your life to perhaps fulfill that need?