It might be helpful to remind oneself that it is not the therapist with the power. The client has the power. The therapist is just a tool for the client.
I get so anxious/stressed whatever about going to an appointment with the one therapist I see that I get extreme intestinal distress and I throw up. I do not see the woman as an ally or having something I need or anything like that. But the idea of going and saying to another human usually what I do not, I find stressful. When it becomes unbearable, I take a break and regroup.