Yes, I get this all the time with every relationship when I no they will be leaving or when t goes on holidays or when sessions finish. It has lessened because t has been consistent with my sessions and has never mentioned cutting down or finishing. This has really helped me to contain my anxiety. This relationship has been paramount to teaching me security and consistency ( we argue and have ruptures but she is always there). I have managed to trust that t isn't going anywhere, well not for now. We talk about this feeling I have about endings and finishing up therapy a lot. We talk about what I need when I get anxious and inconsolable. This helps me to talk about it and when I say it it doesn't seem as big.
I do hope you can work this true with your t as it seems very hard for you to deal with alone

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