Game freezes when leaving in a bed

I REALLY  need help, I've been unable to enter a world since last time I was in it, I left the game I left while I was in the bed, what I see when the world finishes generating is the title screen, the minecraft logo, the two options: Leave Bed & Open Chat, and the main menu all at once and the game is frozen. Someone please help! I've worked so hard on that world and the fact that I may lose it is literally making me want to cry. HELPPP!!!!!