I think it's good that you feel comfortable with the wife-T, and do think you should talk to her.
I've never been to marriage therapy, but I think it would be really uncomfortable for me too. And seeing a husband/wife T team would make it even more complicated.
It sounds like this appoinment (unlike the first one) was somewhat manageable for you. I think you should give it another try.
I think talking with the wife-T before your next appointment will help you be more comfortable. Is there anything else that you think would make you more comfortable? Maybe writing down some of your feelings/thoughts from last session.
Maybe you could ask the Ts to explain a little how they work, (if they haven't already) and what some of their goals are for each session.
I don't know.......I don't blame you for freezing, because I would have too, and I'm just trying to think of some things that might help me if I were in that situation.