You did a mistake by starting so early. 2 years is not an age for sending a child to school. At this age, most of the children are having separation anxiety (anxiety about getting separated from parents, family or familiar environment). Forcing child to go to school before he can overcome his separation anxiety will result in School Phobia. Crying is one of the symptoms of School Phobia. You have tried every thing that means your problem is already messed up. Please consult psychiatrist near by. Remember patience is the key.