When my therapist was away recently I was going through the mental calendar with her... I said "So you'll be here next week, and then gone for the two weeks after that?" She replied with "Yes- I'll be here next week, then I'll be away for two weeks, and then I will be here again."
That last bit made so much difference to how I felt about her going away. Instead of focusing "she's going to be gone" I was able to focus on "...then she will be here again."
I don't know if thinking of it that way might be helpful for you. Every week your therapist is there, then you go through the week without her, and then she is there again. When she goes away the time between seeing her will be a little longer, but when she is done she will be there in her room again.