Sat in the parking lot after... tried to capture as much on paper that I'd like to follow up while it was fresh. Went home, wrote some more. Next day, refined the notes. I'm going to try to use them next week.
The actual prep for something with ADD is simple.

Leave at the last minute and panic a bit. The adrenaline starts going and you're a bit more focused.
Problem is, if you don't time things exactly right, you end up running out of that stress high right as the appointment begins.