Hi, Karen. I am 62 and just started transitioning a couple of months ago. I am planning to go full-time in a month or two.
It is quite perceptive of you to recognize the connection between your depression and your gender dysphoria. Ultimately, you have to be who you are.
There are tough choices to make. I was lucky: I had no children, I was retired on a resaonable pension, and, when I gambled my marriage and told my wife, she came through for me. Obviously, your situation is similar in some ways and different in others.
It is a very good decision to seek out a gender therapist. Have you checked with your current therapist to see if they know of anyone in your area?