Yes, leaving in tears is quite common for me too. I agree it needs to be tough but not so tough you give up on it. It also takes time to feel comfortable to talk to the therapist, to build up trust.

I email my therapist things I find had to tell him or things I forget. I dont think there is a right and a wrong way to explain things. Its whatever works for you. We dont always talk about what I've emailed him. It sometimes helps relieve the pressure on me if I've told him something in email though otherwise I get annoyed that I didn't spit it out again.