I'm not sure what the details here are, but it sounds like your therapist is moving permanently but you just don't know exactly when? If that's the case then totally normal to be freaking out about it. It sounds awful to be put in limbo like that. If I were in your shoes I'd probably feel just the same, and want to talk about it. Perhaps you should start working on the transition and saying goodbye vs trying to trudge forward with therapy that might be stalled at any moment?