I really symphatize with you as I go through something very similar with my former therapist. Youīre really "lucky" who have the access to a new therapist even if it canīt be the same as with your former one.
I recognise all the longing, all the replays in my head from situations in therapy, missing her and seeing her as a very important person whom I lost. I have no access to consolation in all this, I can just grieve and wait for it all to pass, hoping itīll fade by time.
Itīs just raw and I understand at least something of what youīre going through.