I lie in my bed, think about horrible things and then remind me of the bright side of my life. Normally I am a really strong-willed person everybody can rely on and the one who tries to smile all the time and give everybody courage but at home I'm always pretty weak. So I make the most inaccurate thing, too: sleeping, 'cause there's nothing who would listen to it.
I pray. There's nothing like turning to someone more able than yourself when the world gets you down. most specifically, being catholic, I try to put such concerns into the hands of Mary.
deal is, I am not able to solve the whole world's problems, but God is. therefore prayer is a healthy response to feeling overburdened because it returns us to normality, and to being o.k. with being weak and normal. Someone else has it in their hands; you do not need to worry.