I'm curious about why people are saying that Lola isn't qualified to diagnose mental health conditions. She is a Licensed Professional Counselor and as such, diagnosis is part of her job. In Ohio, we have both Licensed Independent Social Workers, which I was, and Licensed Professional Counselors - both professionals that diagnose. If you can't diagnose, how can you treat?
Also, writing a letter to someone (or to your younger self) to express your feelings, and then never sending it, is a long-standing, well-accepted therapeutic technique.