The dead file

I was playing Minecraft and strange things started happing like the villagers starting changing textures so I left the game and checked my textures the villagers texture was not there neither was the pig and cow but they seemed normal in the game I check the rest of the files and I found a file called dead and when I opened it there was a file called leaved I opened that one it said stop trying nothing in it I kept playing nothing odd happened for a while but a few days later I got a email that said stop I thought it was just somebody hacking into emailing me so I kept playing a few weeks later file was gone but when I went back into my game in said of hearing the music I heard a crying child I check the bottom of the village well because I heard of stories of odd things being in well I found a cave with Redstone torches and  I saw a distorted player but the player had no name tag and then I died in the game I saw it again this time distorted dog and it killed me I stopped playing the game for a few weeks and I went on my realms but then it would not let me join so I played bedwars and it was normal but when I started playing single player again my house was burning with the rest of the world in the game so I left and deleted that world but when I played on this I heard a crying child with a child screaming I tried leaving the game I couldn't I tried using the alt f4 it did not crash not even when I tried turning off my computer it last a few days after that nothing else happened