Just after a break up you will tend to be depressed, sad or angry for a long time. Some people don't manage to get over a breakup or divorce even years after. You will find it hard to concentrate, feel tired and weak all the time and you might even lose your appetite for FOODs that you once loved. Try and get over this state as soon as possible. Don't isolate yourself as that is what worsens your depression and instead, strengthen your relationship with your family and friends which you might have neglected for a long time.