What would happen if you, instead of emailing, actually picked up the phone to call your therapist and spoke to him for a few minutes about the need to talk about your reaction to this change next time you have a session? How different would it be to actually express that need and allow him to dialogue with you for a few minutes so that you can both clarify your communication in real time? Maybe two minutes on the phone would actually be more calming and communicative than throwing out an email and being left to stew about the unfairness of the limitations of emails.

Something to think about maybe?