Ooo, actually I got the idea right now (writing down the story usually helps). I thought about something like:

Wow, point taken, no more silly e-mails from my side.
Yesterday I asked about the session as I wanted to come when I still felt the connection to go through the triggering part together. However, after your response I already lost the connection totally and I went through triggering part by myself (I guess I am still triggered) so there is no need to have a session tomorrow. I'm sorry if my e-mail was misleading as it wasn't my intention to schedule an addition session after you had let me know that the next one is next week. I'll come on Tuesday.

Is it too "strong"?? I guess I'm still to angry to write something polite but I definitely should write something soon (it's already an evening here)