CE, just my opinion, but don't see how the stuff you have posted about your T means that she has a big ego. She appears to have a way in which she is doing therapy with you that she feels is in your long term best interest. You disagree with her and get angry and rail at her, and she (it sounds like) pretty calmly tells you why she is doing what she is doing. Disagreeing with you does not equal big ego, at least in my opinion.

Maybe I'm prejudiced on this matter because I recently got an ethics complaint. I fully and carefully explained to my client (in writing luckily) my legal opinion of how we should handle his appeal, given the facts of the case and the current case law. He disagreed, and I wrote him a second letter, addressing all of his points, and giving him case cites for the legal precedent that controlled in the case. I explained why I could not handle his case the way he wanted. He wrote me AGAIN, and again I responded, explaining that his desired method of handling the case would be futile and would require me to act unethically. He then sent an ethics complaint to the bar administrator and luckily included copies of my letters which he thought "supported" his case against me. The ethics administrator wrote back to the guy explaining that I been both prompt and courteous in responding, had given him accurate legal advice, and stating that his disagreement with my professional judgment did not constitute an ethics violation on my part. There was no power struggle between me and my client, at least on my end. I would just repeatedly explaining to him why, in the exercise of my best legal judgment, I could not do what he wanted.

It appears to me that is what CE's therapist is doing. Repeatedly telling him that, in exercise of her best professional judgment, she will not do what he wants her to do. CE's disagreement with that judgment does not mean the T is on a power trip. If he disagrees strongly enough (which, given the number of times that this same situation repeats itself, it appears he does), then it's past time for him to get a new T, rather than keep trying to get her change her professional judgment in the matter. I rather admire her for sticking to her position. I am sure that it would be much easier for her to simply give in.