my son has had a high temp of 38+ for a few days, the doctor has given him some penicillin today. whats worrying my wife and making her cry, is that at some point last night this morning she felt him and he was cool, so she replaced the blanket with his 4.5 tog duvet. then when she checked him this morning after maybe 5 hours he was roasting hot. now shes worried she might have caused him some brain damage. is this possible?