Sorry you're here, but you'll find good advice. It's good your W is still in the house, it's easier for her to see your changes than living separately.
My doctor has put me on trazadone, it's a antidepressant that has sleeping qualities. I only take it at bedtime, works well. I agree you and D need to talk to C. Have you thought about coaching?
Mike
M 51 W 49 S26 S25 D24 D19 Married 27 yrs T over 30 S 7/12 D-bomb 9/26