Whole world gone after glitching

Today I got onto my world and then it kicked me out, so I got to the page to get back on, and the name was deleted and it was creative mode. I know it was survival before, so it was odd. So I changed it back and tried to get back in, then got kicked back out. When I got back, the world was gone! I had my largest build on it, farms, villages, giant lakes, and my Colleseum. Can you guys help? Thanks.

Alyango Danger