my world got deleted for no reason and i had put alot of time and effort into it so i would like it if i could get it back

so i logged into minecraft and i noticed that my world had dissapeared and i looked in all the files and it wasnt there. i was upset as i had only got it for christmas and  that something like this already happened. i had spent 2 days building a really nice house and i had full diamond enchanted gear. i would like it if the world could be restored and put back into my game please

the world name is 

im th best e