I think a letter to yourself is a great idea. Make it a love letter, or write a love letter to yourself in addition to the letter you're already planning on writing. SDFoundGirl shared this idea before, I did that and keep it sitting out for myself to pick up and read now and then, and it's been helpful.
You sure will make it through. Glad you know it. As my therapist says... how you're feeling and how you're doing are two different things.
Have a great few days off!
Me: 37 M: 14 yrs Separated 10/06; Filed for D 12/07 Life is good.