I am sorry you 'lost' your Therapist. Your feelings do make sense as you no longer have that safe person in your life anymore.

As for suggestions, it will sound cliché but the only way out of the pain is to go through the pain. It's a process, it is not time-limited and it can be supported with people around you e.g. your interim therapist, your close friend group. I would not judge the feelings but feel them and let them be. Get as much support as you can.