Hi Gerber,
Happy Thanksgiving!
I can't tell you how to close the emotional gap. I can only tell you my own experiences with this issue.
There have been times (and still are) I want to tell T something and I have felt that sort of bursting at the seems feeling that you describe when I want so bad to share but can't find the words or the courage.
Some things I have tried are telling him dreams; writing him letters. Once I had a really intense session and called afterward and told him something on the machine. I also get to therapy a few minutes early and spend some time in my car or in the waiting room just breathing and centering myself so I am more relaxed when I go into the room.
When I feel I have something to share but just can't manage to I think it's a message from my inner self to wait. The right moment will present itself.
Breathe. Take your time. Allow yourself to know when you are ready.
Good luck.