I was training in Dominica before our first Test in the West Indies in 2015, by facing local bowlers in the middle. One delivery hit me on the side of the helmet, but it was not the fastest delivery I had ever faced, so I thought I was fine. I carried on practising.
The next day, the team doctor, Peter Brukner, asked me how I was feeling. I said: "A little tired, to be honest – feel OK, just a little bit tired." And he pulled over me over and said: "Sorry, mate, I'm going to have to rule you out for this next Test. You're done. You're showing symptoms. You're out."
I was, like, "Hang on!" and then other people heard about it, and they are probably thinking "maybe I don't say I'm tired, maybe I just pretend I'm fine".
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The symptoms did not leave me for two weeks. That was a real worry. And then you start to wonder about whether these symptoms are going to be long-standing, whether it is going to affect you in later life.