For me, this is right up there as one of the most stressful things I have had to do as a parent.
I know he is okay once I'm gone. I know it is for his benefit that he goes. He's 3 yrs old. At the end of the day he comes racing out bubbling over with all the fun things he's done and how cool his friends are and how much he loves nursery because he's a big boy. It's just leaving him there in the morning that is so horrid for everyone.
I just hate hate HATE having to prise him screaming off me and pass him to someone who doesn't love him. I swore I would never do that but all the positive parenting in the world won't make him trot happily off to play with his friends on the slide. I want him to stay because he wants to, not because I make him.
AND... on a related note, how do you tell the difference between not wanting mummy to leave but being fine really, and genuinely hating it there to the point where it is a negative experience? In the course of settling my son in I saw children who were unhappy all day long, every day. A few years back my daughter used to sob because she hated it so much but I was so indoctrinated into believing that they all say that and they're fine when you're gone that I jollied her into it every morning. I now look back and realise that she had a horrible time there. She still talks about her mean teacher and all the shouting.