If you're having trouble saying things in session, one thing I've done is e-mail my T about it (depends on if your T allows outside contact) or else typed it up, brought it to session, then handed it to him to read. I would just try to find a way of telling her what you said here.

And you could always try out another T, even temporarily or just to see one for a consultation session (some offer a free 15-minute phone call or in-person consultation). When I didn't think things were working anymore with my ex-T (who I'd been seeing 6 years), I decided to see another T, with the idea of consulting with him for a month or two about certain issues, then going back to ex-T (I told ex-T this after making the appointment). But then I found his different perspective and approach was helping me, so I opted to just stay with the new T. So that's something else to consider.