Plan something you want to do for when he is away, that you couldn't do with him here because you'd have to go to therapy. Then, plan something bigger to look forward to that will happen after he gets back; when I terminated with my T, for example, I was moving house and then going on an international trip right after so I was almost glad I was terminating because I really wanted to concentrate on the new house/upcoming vacation.
Think about the patterns of your sessions; do you take off work or do anything the same each week? When my T went away for her 4-8 weeks times off I would not tell them at work, would continue to leave in the afternoon each week as if I were going to therapy :-) I got a little "vacation"/early leave time from work that way. It was relaxing to be home early and able to do whatever I wanted, etc.
Too, I use to grab a handful of individually wrapped candies in the morning of therapy day and start eating them on the long drive in the afternoon getting to therapy and played a game trying to make them last until I got home in the evening from therapy. I converted that habit into a "marker" for how long T was away, I used one candy for that day and had them all together, ceremoniously ate the one for "that" week the same time each week, etc. It helped me feel the continuity of before to after and I could get a better grasp of the time passing/how much time left until T was back.
Too, I bought blue "exam books" that are like 8 pages
http://www.shoplet.com/Roaring-Sprin...OA77512&rtop=1 and did a weekly "report" which I mailed the same day each week (usually a weekend day) to my T's work address.
Think up various projects like that or ways to "test" how well you function without T. Deliberately try to do things that scare you to see if you can tell if you are better able since starting therapy. Range across the whole time you have seen T so you know how "small" the time period of his being away will be.