My best advice is that your T only knows as much as you tell them. Yes, they often can read between the lines or pick up on body language, but for the most part, if you choose to lie or hide things from them, they won't be able to help you in that regard.
In my case, I lied to my T for months about feeling suicidal because I was afraid to tell her. But if I had just told her from the beginning, she could've helped me right away and I probably wouldn't have felt so bad for so long -- and she could have kept me safe if I needed it. She also didn't realize how bad off I was, because I was hiding it from her. It was hard for her to help me without knowing the seriousness of my situation.