Posted a couple of days ago about a weird virus both Dc (5 &6) have picked up. They've both had a high temp, headache and neck stiffness. Oldest is now better, it only lasted about 24 hours. Youngest seemed better this morning but quickly went off again. Temp isn't coming down much with calpol and ibuprofen, it's sitting at about 40 but coming down to about 39.5 with medicine. He hasn't been able to stay awake since about 3pm. Is shivering non stop, boiling to touch apart from his hands and feet which are freezing. Obviously I know these are normal signs of fever but at what point do I need to worry?