This sounds so painful! I'm really sorry you're going through this right now. That intensive probably stirred up a lot for you, so I'm not surprised you're still having strong feelings. Also thinking about ending your marriage is a big and probably anxiety provoking thing to be thinking about.
I'm sorry you canceled your t appointment for this week. I know what it's like to be so overwhelmed that it's hard to even talk, or feels better to just be alone. However, I think your t should know about this. Maybe call or e-mail her?
I really hope you feel better soon.