I agree w/HazelGirl. I hope you'll continue emailing him. It's helpful, it's valid. It has worked wonders for me personally. I think you're feeling threatened because he encouraged you clearly to transition to more in-person disclosures, but I do not get the sense that he's setting new limits, just wanting to help you progress.

Maybe you two could talk next time about how threatened you feel and I hope he'll partner with you to explore what you can both contribute to help you feel more safe in session. That took a lot of work for me and I'm so glad I did that work.

For me it included having a lot of control and some accommodations, like doing anti-anxiety or grounding exercises, visualizations, time to be silent without pressure, to go in small steps, and much more. The point being, it's not an all or nothing, now or never dilemma. You can probably continue communicating the way you always have, and just work on sharing 5% more in session, just a tiny bit, little by little.

Take care! Maybe give these feelings some time to settle. When I react that strongly to something in therapy, just waiting a day or two to see how I feel then and revisiting it when I have calmed down some helps.

P.S. It's as easy now for me to email as it is to speak in session, but I wanted to reassure you I haven't given up writing. Writing is valid in its own right and I think it's a uniquely helpful form of communication, so I don't even think you need to see "giving up" writing as a goal, but just being a little more authentic in therapy as the goal, so you can take in more of what he has to give there.