i get that way if i sweat outdoors and then don't wrap up a bit when i get into the shade.
as they say, it's not the ups and downs that'll get ya, it's the jerks!
the other day it was 25C in London, and 16C in Rome. if i were you, i'd be getting out your hammock and sunblock... ~"When an inner situation is not made conscious, it appears outside as fate." Karl Jung~