Oooh, yeah. This kind of change would be upsetting to me too. It's already hard enough trying to juggle therapy and work. That said, I'd also appreciate the T's honesty, and maybe look at it as an example of advocating for yourself? What I mean is... this is how people handle situations when they commit to something, but realize that it might not be working for them and want to make an adjustment. Sometimes it's good to have an example, so that if something comes up for you, you can do the same.

A couple of thoughts:

You said that you can't really say no. But, it sounds like your T actually did give the option to say no to the change? So, you can. It sucks, it will be hard, but it would be a way of you practicing self-care, right?

Something like, "T... I'm really sorry to hear that you're tired out by 5pm. I wish I could come an hour earlier, but my work schedule isn't going to allow it. I'm already coming in to work earlier than normal, so that I can leave earlier, and have a long commute to get here... trying to get here earlier isn't going to work for me."

I've had to say something similar with my piano teacher. In fact, this week he was out on my lesson day, and wanted me to come earlier, the day before, to make up my lesson. I told him that it wasn't going to work - there's more traffic, and it would be hard to get out of work early enough to get there. (So instead, he'll credit me on the next bill for the missed lesson.)

It's unfortunate when we can't easily change something to meet someone else's needs, but it happens - it's part of the negotiation of life. She asked, and you're perfectly within your rights to tell her that it would be too much of a hardship.

Everything else that your feeling, the anger, frustration, betrayal, etc... I'd feel like that too. But, it might be worth talking through some of that with your T, if you can? In theory, it should be good stuff for therapy (but some therapists are not so good at handling it when it concerns your reactions to them, so use your best judgment!)

Good luck. Scheduling changes, especially when you have to coordinate with work, are always hard and stressful. I hope you guys can work out something good for both of you!