I have felt this way too, sometimes to the point of sabotaging my own progress so I could still work with T. I realize all Ts are different, and some systems require termination at a certain point. Not sure if that is the case for you? Have you talked about this with T? I am nowhere near ending work with my T, but we occasionally discuss what happens when I am doing better. We may decrease sessions, but T has let me know that as long as I'm willing to do work, I can continue with her. She said some people benefit from therapy indefinitely, which made me feel a lot better.

I hate those abandonment feelings though! Hope you feel better soon!