I can usually tell the deference between a normal sadness and my stuck-in-it sadness. I think T is right that it is normal to feel sad in a divorce. A divorce is very stressful and it is the end of a relationship that was very central in your life. It is sometimes seen as being like mourning a death. Despite the fact that it is normal, it does not mean that you just have to wait until things get better. You can still take little "mini-vacations" from the stress and all of the stuff that is going on right now.
I'm sorry that I can't answer your question better. I hope you have a good session with T. I hope you find a way to cope as you deal with the divorce.