of headache cannot think

This morning I took a 20 minute ride in a cab. The cab driver was new and he said that seeing so many cars during peak hour gives him a headache.

He prompted me to give him exact directions to my destination because he "cannot think properly. Headache ah. Chia lat!". So along the way, I had to tell him where to go.

For most of the journey, he talked about football and all the matches that were played last night. Arsenal this. Liverpool that. He was sharing all his betting tactics and strategy to me.

I guess it was not the peak hour traffic that was giving him the headache. But "his strategies" that were mapped out in his head.