DS (11) started feeling unwell on Sat, went back to bed with a headache. Vomited a while later, slept most of the day hot but manageable with Calpol and Neurofen. Sunday perked up until eve when he suddenly hit 39. Shivering, cold hands/feet. We took him to urgent care, they say 'start of a chest infection' and gave us ABs. 9pm by this point and nowhere open to fill prescription. I slept with him and kept an eye but he hit 40.6 during the night even with the calpol melts. How long for the ABs to hopefully kick in? They made us feel so silly for bringing him with a cold basically, .. but he's still 40.6? And the cough is now something else.