I understand your feeling, your situation and your loss. I would recommend you to keep yourself busy in something... read books, listen to music, write something, hang out with friends, do meditation or yoga... so just keep yourself busy. Death is a bitter truth. I understand that, yet you are suffering from this great loss, but time will heal all the wounds. Time is truely a great healer. The wheel of time keeps on moving and life moves on. Don't worry, things will get alright.
Remember, when a person takes birth, h/she have to leave the world one day. Some leave too early, some too late... but one should not spend his/her life in sorrow. After a sad day, comes a glad day friend! So, be happy.. I know yet its hard.. but try. Your life is waiting to see you in joy.