Therapy can trigger a lot of anxiety for people with abandonment issues. I have sometimes experienced the end of a session and the wait for the next one as abandonment. I have also felt that her vacations were a form of abandonment. I'm doing better now and can tolerate her absences better than I could before. However, I suspect that I'd experience her death, illness, family problem or retirement as abandonment. Other than retirement, those are things she has little control over and cannot make promises about.

In good therapy where the therapist is competent and ethical, "abandonment" is in the heart and brain of the client. It is our issue to work on. The therapist can assure you that she won't terminate you without cause and has no plans to retire or move but beyond that cannot really promise anything. I think you should focus more on healing your fear than on holding onto your T.