Game Crashed While Loading World Lost.

My world of around 385 mbs was gone after it crashed while loading.

A very quick error message popped up but i couldn't read it, it was on the screen for less then a second. 

IS there any way to retrieve the world? I tried to clear cache but that did not work.

All of my friends and I play this world daily so if its gone for ever that is extremely disappointing. 

UPDATE: 

(Uninstalling your account -> hard reseting xbox -> reinstalling the account -> load minecraft)

The world was there, when i clicked on the world it was grey for some reason, all the worlds were grey. 

It says when i clicked on it "failed to sync the world, The world is not fully synced or has been corrupted" 

I thought i fixed it. What now?

Ive uninstalled and reinstalled twice aswell after this new issue.