Help please

Ok so my friend has a cousin who's like an older brother to him and that cousin got into a severe wreck yesterday. He died twice last night but they were able to bring him back both times and now he's in a coma..but my friend is now really depressed and thinks that his life isn't worth living because everytime he thinks its going good something comes and ruins it and he's worried for his cousin and he's basically freaking out and I have no idea how to help him because although I've had family members die, quite recently actually, I wasn't super close to them like he is. They did everything together and were bestfriends..I don't know how to help him.....

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