When you feel rejected, assaulted, alone, depressed, angry; you are creating separation from the world, you disagree with it, you are judging it. The best thing to do is accept this moment and be fully aware of the emotion you're experiencing, without rejecting it, but without feeding it with more thoughts, watching the thoughts that arise involuntarily and let them pass, stay present and rest on the awareness of being aware, of being alive, of being experiencing. Let your mind be as motionless sky and let your thoughts and emotions arise and pass like clouds. Do not fight, do not reject the experience, do not act. Stand still watching your mind, go for a walk alone and coordinate your steps with your breath while you attend to emotions and sensations in your body.
Do not analyze the triggers of your emotion until it has diminished or gone altogether.