Hey, I'm really sorry you lost your dog. I cried when my cat died, He was with me for 18 years...
But now, read this: "putting others first". What is it?
It is a typical behaviour of the depressed. Come on, now that you are no longer useful to anyone you may die? Even if it was true (and it surely isn't) you have to be useful for YOURSELF! Or not?

The best of luck