My 2.5 year old boy just started preschool a few days ago. He cries hysterically when he goes to school and has nightmares at night. I am close to pulling him out from school. What should I do?

Starting school is a huge milestone for children. It may be too overwhelming for him having to be around so many strangers and without relatives for so many hours. Do give him more time to adapt to the environment. It might take up to a month.