Is It Wracking or Racking My Brain?

The correct and original spelling is racking my brain. But the variant wracking my brain has become so well established by now that only strict traditionalists consider it a mistake. So, if you want to be perfectly correct, use nerve-racking and racking my brain.

Is it wracking my brain or racking my brain?

The spelling 'rack' is now used in all senses except for the seaweed called wrack. So it's "rack and ruin," … "racking my brains," and so on. Some other usage guides provide a way of dealing with this question that has a certain brutal charm: just stop using the word wrack.

Is racking my brain?

to think very hard: I've been racking my brains all day but I can't remember her name.