A Doin' A Tailspin
You're acting like you're on a roller coaster and your brain just got kicked by a donkey.
At the grocery store, I was A Doin' A Tailspin because I picked up three different types of cereal and couldn't decide which one to buy.
He was A Doin' A Tailspin in class because he thought the teacher was talking about aliens and it was just a math problem.
She was A Doin' A Tailspin in the car because she tried to text and drive and ended up spelling 'hello' as 'h3110'.