What's wrong with my dad?

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My dad's about 52 right now and he has always had an anger problem. When I say anger problem I mean like he always snaps and he gets mad really easily. I thought he had gone passed his midlife crisis couple years ago when he went thru bankruptcy and law suits. Our family has been pretty peaceful after that. But 2 days ago he was ok in the morning and afternoon. And at night he fell asleep in my parents room and all of a sudden he woke up and he just start getting really mad. He start slamming doors and just stop talking to us. He slepted in the living room and he doesn't eat. We don't know what's wrong with him. My mom said they didn't have an argument and she said he told her he's just mad at himself. What is wrong with him? it's been 2 days and he's just so angry at the world or something. He lost his company during the bankruptsy so he's a driver now picking up kids at school so he doesnt have a lot of stress.