It helped me to acknowledge that I was angry at my therapist for going away and stop using energy to try to figure it out, make it betters, etc., just let it be; accept it as the base starting point. Then I figure out 1-2 projects to do: one for while my therapist is away and one for something that's going on in like October that I want to work on getting ready for. I often kept a daily journal for the 3-6+ weeks my therapist was going to be away or I would hyper-focus and decide I had to pick one word for each day or one sentence describing the day or describing what I had learned that day, etc. and I'd take a piece of lined paper and write the dates down the side for the purpose. Or, if I had a ritual for therapy days, I would continue it for the time period my therapist was not there, kind of like a prisoner marking off days in their cell I use to take a handful of large life savers in the morning of my therapy day and try to make them last until I got home again late in the evening (my drive was long to/from). I would do that when my therapist was away, too, as a kind of continuity thing. A couple of times I did not tell work that my therapist was away and would take off the afternoon as if I were going to therapy. Think of a project to connect to your therapist like that? Maybe write him an email only on your therapy day to tell him briefly how/what you are doing?

Do you like Halloween or take classes in college or have a birthday or vacation or anything coming up you can focus on and work toward that happens after your therapist gets back? Being able to imagine yourself psychologically beyond the period he'll be away has helped me. I used it too when we terminated; I had joined a group, was moving house, going on a European vacation, etc., had a lot going on after termination so I could help myself not get stuck in the ending.