Sunday evening, after getting back from my templestay, I had a splitting headache. At first, I thought it was something about the long journey and/or about the experience that was making me feel terrible, but then I thought back to the last time I'd felt that way: my first few days in Tokyo last fall. I must really be a terrible caffeine addict! It's withdrawal, of course – there was no caffeine in the food/drink we consumed at the temple, and I'd neglected to bring a backup supply.
So a few cans of cold coffee later, everything was fine. But jeez… I need to cut back, I think. This will be difficult.