My T does this with me frequently to try and help me release the anxiety and get unstuck. Some times I can try but he usually says we need to keep working on it. Other times I panic more and start begging him to stop. That is when he reminds me that our emotions are trying to tell us something and he doesn’t want to make or pressure me to do anything I am not ready to. I am very self conscious about my body as well but mine is more because I am trying to disappear into the chair and not be seen. My fear also keeps my hyper focused on potential threats and so sometimes I am just not feeling safe enough.
Does your T know how you feel about your body? That may be something you need to talk with her about in session. If you are not ready to do that then could you let T know the breathing makes you uncomfortable?