Herobrine Killed Everything

hey don't 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 dragon egg and I saw a giant E 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 hard core so when I died the world was lost and I shut down my laptop for 3 days and then minecraft was normal.