To deal with the grief caused by the horrific attack on our country in New York, you can use the same craft a writer uses. There are many devices the bards utilize to help their characters resolve the diversities they face in life. Here are a few of them.
Inner thoughts and inner monologues, different from actual 'feelings', are like holding a conversation with another person -- you. These thoughts and feelings from the deepest part of ourselves not only reveal the most about us but they are also a way to thrash out what's happening around you, sort out your emotions and reach your own conclusions of action or non-action. Use them, exhaust them and make your inner thoughts about what has befallen us your constant companions, like a writer does, until you have reached your resolutions.
And, like writers, you can make your inner thoughts and inner monologues more vivid, more useful by adding your actual feelings to the mix. Write everything down as each occurs to you! And, like writers, you will soon sort it all out and come to terms with the torments of an unfathomable event.
EDITOR'S NOTE:
As a collective group of writers, it's the only tool we have to deal with the human condition in general and our human foibles specifically.