my brain hurts

I've been in Taipei the past few days doing some interviews and other events for work. It's been a bit of a stretch for me, in terms of Chinese speaking ability, but still a good experience. Unfortunately, I've had a headache for most of the afternoon; I can't decide if it's because I had to get up at 7:00am, or if I'm just tired from extracting Chinese vocabulary words from the furthest corners of my brain.