World Deleted

I was playing and logged onto Minecraft to play and loaded into my world and then all the visuals looked corrupted and checkered pink and black pattern and I logged off and restarted the game and I load back then I purchased a realms subscription then the realms said it was unable to create a world then after that I decieded to play my world again then I go to log onto it and realise it is no longer in my world menu then went to my world storage to see if the file was still there and it was gone and the world has just been completly disappeared and over 1100 days of playing is gone. if you could help to get it back I’d be willing to give any information I can