I got a bug

Dear Mojang. Right now I'm having trouble. When I was playing minecraft games then suddenly I sign out of my minecraft game. I'm having trouble when I try to log in again. And when I can get back into minecrat, I've lost my world. I lost the whole house I was building up 😢. While I never delete my world. Please help me, mojang. What can I do ? ... Please to fix this. Thank you before. I love you Mojang ❤emphasized text