Headache.
Didn't want to make two trips, so I hefted a stack of files whose height was arm-long and came back to the office. Strangely, exertions give me headaches nowadays. Using the machine for biceps in the gym, doing a few sets of pushups... Makes no sense. Even when I try to control breathing it still gets the blood pounding in my head. Then nausea follows.
Yucks.