4yo ds2 has, over the past 3h, developed a temp of 39C underarm, is hot to the touch with cool hands and feet, incredibly grumpy, complains he can't stand, complains we are hurtign his neck when we pick him up, and has suddenly fallen asleep in dh's arms. He is not deeply asleep - moaned when I disturbed him to touch his feet just now.
Is this enough to warrant more than just Calpol (which I have given him) and watching?