Go to the book store and browse the parenting section. One or two books should stand out. While you are there, check out the personal growth section. Buy them, read them, then go back to book store and repeat.
Focus on your relationship with your D15. She needs you now more than ever.
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712