There are at least 5 options here. I'm going out on a limb seeing you are a Rev, I'm assuming you are waiting for your next appointment at your office.
1. Do you have a phone list of people you are supposed to call today? Why aren't you using this time for at least one of those calls? You are in control of a call - all the time. When you need to, because your appointment shows up, tell them you will call them back!
2. Who died? Who just got married? Who is sick? Who just graduated? All these notes you need to remember to write (note I said write, not email). You are in charge of when you start and when you stop.
3. How challenging is this next appointment supposed to be? Meditation, prayer, relaxation techniques, are all a good idea prior to having to give good advice.
4. Read that form, book, email, that you can put down when your appointment arrives. That way, you won't be tempted to look at your computer screen while you are supposed to be listening intently
5. Get up, stretch, get a cup of coffee or ice water, a couple push-ups, getting the blood running is good anytime - for your mind, body and patience.
Best to you Rev Atkins!