His brain was spinning but got no traction.

His brain was spinning and he tried to slow it down and get some traction on this thoughts.

His brain spun with the thousand questions he had to ask.

His brain spun into a cold web of purpose.

But now his brain was spinning with questions.

The sergeant's brain spun with questions but no answers.

But my brain was spinning down and down the sides of a maelstrom.

Her brain was spinning with the shock of his revelation.

Liz decided that as long as her brain was spinning, she'd give it something to focus on.

His brain was spinning in a wild search for a plan.