My boy gets nightmares at night and reduced appetite and fear of shower now after starting school. It's been almost a week and i am so close to withdrawing him!! He is 2yrs old. It really is not normal right?

It is normal. I've known of kids who fall sick n cry Everyday for 1 mth before they finally get use to school .... do not give up. It is easier for him to get use to his school now then withholding it till primary school