My T is in an office building. Her waiting "room" is the lobby for the floor her office is on. So, I sit there waiting, with all the traffic through the lobby, and other people having conversations, and I get more and more anxious! Fortunately, my T is almost always right on time. She's learned that if the traffic in the lobby is especially heavy, then I need a few minutes to calm down, and I've learned to ask for that as well.

I tend to either bring a book to read, or listen to music, or even play a game on my phone. Just something to distract me from the other people and the waiting.