My character is moving randomly in every direction

I just happened to have the idea on playing minecraft last night in survival, after saving it I checked it once again in the morning but something's wrong with my player's movement, He keeps on going different directions and if I press spacebar he keeps on jumping up and down. And whenever I toggle the inventory, it stops. From till then I am so pissed on why i can't play minecraft because of this trigger-happy bug. So please, if you do have a solution please post it for the sake of all my hard works in the city I've been building for almost 2 years and for all Minecrafters. Thank you