See things for what they really are.

When something happens, the only thing in your power is your attitude towards it; you can either accept it or resent it.
Things and people are not what we wish them to be or what they seem to be. They are what they are.

—Epictetus as translated by Sharon Lebell

This is one of the best passages so far in this little book I picked up, A Manual for Living. Things happen. Once they are done, they are done. Denial and anger accomplish nothing. The world has changed, for good or ill. You either change with it or waste your time in useless raging. That's not to say an emotional response is a waste. It is natural. The waste comes when we refuse to let go of that emotion when it has served its purpose.