I am not sure if you were asking for opinions and please correct me but I think (could be wrong though) that the feelings of abandonment to the therapist are actually a therapy material that is coming to the foreground to be worked through. Rather than working hard to keep your "mind off", maybe trying to grieve your childhood memories where you recorded the first abandonment and soothing the parts coming up for recognition will help. In my experience, gosh the first time I remember having this feeling of being dropped off and abandoned was to my therapist's like 2 weeks vacation. I was seeing him every other week so that turned into a month long and I lost all appetite and started to sleep like a dead baby. I said dead baby cause I had no memories of when I was ever abandoned.I felt wtf sort like why am I feeling this for the therapist? yes I cared for my therapist but I did not even feel this for my husband... I have huge family and was never alone ...but as I started to talk to myself and acknowledge to my body there is something I do not know and trying to recognize to soothe, to respect to care, all of sudden, the grip was gone. I still get a bang of something if my T cancels or takes vacation but now I have a relationship and sort of memory where this feeling belongs so I find easier - much shorter time to recover than the first time. I always acknowledge every feeling in therapy related to mean a trigger...my whole relationship to therapist for me is rework and re trigger...and honestly I feel that is one reason I do not experience abandoment with my husband away...I miss him but I do not go to the self care sort of mentality.
Hope this makes sense.