For the last 3 nights in a row, I have woken up at around 4am crying and shaking, with full believe that my best friend is dead.  I read somewhere that when we stop being friends with someone, we mourn them, as if we had lost them, to death or something similarly tragic, in an almost primitive or animalistic way. 
This is how I feel today, like i'm missing something or some part of me, and I have a sinking feeling that my dreams will follow me around all day.  If only people weren't so selfish.