When things get black, keep your head down and don't stop - you're just gonna have to trudge through it. On the other side laughter and your old self are waiting for you.
also, you will never be any good to anyone else until you are good to yourself. be selfish for the ones you love. they will love you for it. (this meaning psychologically, of course, not materially)
I had to give both of these pieces of advice to my oldest daughter recently.
She's doing better.