That's exactly what I did every single session. Although, I remember if there was something very big to reveal, I always wanted to do that verbally. It helped me so much. I remember him saying at the beginning after reading one of my typical 3 pages letters something like, "Wow...I wasn't sure if you were getting it...but you get it better than I do." With a chuckle, of course...

Anyhow, Crystal, sometimes it can be really helpful in reaching your therapist if writing helps you to express yourself. Good luck.