My world called "epic gamer world" is missing. Yesterday it was there and nothing was missing.

My world  is missing, yesterday it was fine and nothing was missing. I log on today and its completely gone. I try syncing my worlds but its not there either. My xbox account is CHEETAHS RULE 7. I've tried going on other accounts but its still not there. I think the new update and bug fixes are the problem. Please help me with this, i've spent the past 3 months on that world.