Just want to say, it is also a first child thing. DD1 was horrid, she still is, but it has just evolved with age. I still have memories of her screaming and beating the bedroom door for an hour plus, or kicking the back of my car seat, all over little things, like leaving someone who we had just visited. Nothing would work to calm her.

Wish I had some answers for you. I would seriously look at food, I do know it had an effect on DD1.