I have universally had this experience:

Anytime I have chosen to disclose something by email that needs some sort of back and forth in order for me to feel okay, it generally doesn't go well. It can make me incredibly anxious to bring something to therapy that I just don't know what kind of reaction I'm going to get. So many times I've done it in a way that I've thought was easier.. writing it down where I can edit it and get it 'just right.' Then push send. Trouble is that when you push 'send,'... you're sending your vulnerable 'self' out into neverland - and have no way of knowing the outcome until you hear from that person. So if they are at the hospital for the next two days with their child due to a sudden emergent illness, you are going to sit there for a few days imagining everything under the sun. It's such a terrible place for us to be.

I had to go through that over and over quite a bit, before I finally learned that it's much better to deal with the anxiety and talk about it in session.. where I could get real-time feedback.