First day and I'm a wreck again

Second grade. Why does the first day of school still freak me out so much? I like the school, trust the principal and parent coordinator, have heard nothing but good things about his teacher this year, and was head over heels in love with his teacher last year. But his Kindergarten year still haunts me.

How long before I don't freak out and freeze up?

Will I ever be able to write an Ask Moxie post again on the first day of school?

How do I forgive myself for not fighting for him sooner and getting him out of that classroom?