Jexa,
I think you handled it brilliantly. Can you try to focus on the positives?

You were honest about feeling uncomfortable and anxious, you established and maintained a boundary around doing breathing/body work, and you steered the conversation to something that is managable for you right now.

I'm sure your T is smart enough to see all of that, and she didn't push you to do more than you were ready to do, which is another small piece of evidence that she cares and can be trusted.

Don't be so hard on yourself!