You get through it by letting it out a little at a time, like releasing the steam of a pressure cooker, and by doing so, you let your T absorb it from you. Her being there, even in silence, (maybe especially in silence), is her holding you psychologically.
You are understood.
There was a time--most of my life--when I thought the simple happiness of daily living was unimagineable.
But it is there ahead of you. Believe in your T guiding you there.