Herobrine Killed Everything

hey do'nt get me wrong I do like minecraft but' when I went to my survival-world I saw no mobs,I wandered in my farm but it was on fire,I wandered in my mjnes' and I only saw some ender-pearls and lots of blocks,when I reached bed rock there was a dra'gon-egg and I saw a giant Q carved into the wall I said to my-self Herobrine killed every thing,suddinly I egan dying I was being killed by Herobrine it was har'd core so when I died the world was lost and I shut-down my laptop for 3 days and then minecraft was normal.