greetings from The Needless Wonder (yes, complete with cape and everything)
Do I ever "get" what you are feeling, BR, I have been there, been there.

Please go gently and give yourself time. For myself, the "needless" bit is a facade, it's a suit of armor that I put around me to protect from OTHERS; it also hides from Others' eyes the big empty places where things I needed never got filled in. But I know they're there...

maybe, after a while, you will feel less alarmed at allowing yourself to be vulnerable - but you CANNOT rush it, it happens gradually and in its own way and time. Many hugs to you, this is hard stuff. But good news, yr T sounds like she is right on the ball and looking out for you.