If he hasn't left yet maybe there is something he can give you for "homework" while he is gone.

When SKR found out that I had a problem with her going out of town, on vacation and in general not being available to me if something should happen she started photocopying workbooks and so on for me to do when she was gone. The time passed so quickly and I didn't miss her so much because I was always donig therapy work even though she was not available right then. Our doing this not only helped pass the time but it also brought our therapy time into my personal life which is what therapy is supposed to do anyway - the client using what they learn in their therapy sessions outside their therapy sessions to solve their own problems and make their life outside the therapy room better.

Even today now that I am with a different therapist I am always doing therapy homework of making up my own therapy projects and carrying over my therapy sessions into my home life for exaple my therapist and I during sessions do relaxation visualizations (otherwise known as hypnotic techniques) when we do them we record them so that I can do them here at home.

If your therapist is already gone you can still work on some therapy work while he is gone to make the time go faster and less hard on you. Think about your last session. pick a question that he asked you and challenge yourself to answer that question with details that you did not give during the session by way of journalling, artwork such as painting, drawing, create a diarama or scale model and so on.