Back when i had major abandonment issues, I remember one time one of my therapists went on vacation for 6 weeks to another country. She wrote on a paper. My name. I will be back. I found a lot of comfort in just that simple statement she wrote and would reread it when i felt i couldn't cope. Maybe your therapist can do something like that. It really did help. I didn't ask her to write it, she just did. She knew me too well. She suggested to journal when she was gone and to share it with her when she got back which I did.