Whenever I'm overwhelmed I get the same advice.
"Think of something that makes you comfortable, makes you smile, makes the world seem entirely right."
Happy thoughts.
I envision his certain smile, the laughs he hands me with gentle hands, and his ambitions in this world, and this makes me comfortable, me smile, and the world seem entirely right.
Truthfully, I will never rely completely on one, because if they are absent, my happiness is naught, but I'm perfectly content with my favorite happy thoughts.