Dd has had a temp for 3 days, have been given regular calpol . She is off her food and complaining of a headache but after calpol is playing etc. As soon as calpol wears off she is shivering and freezing but feels hot. Gave her calpol an hour ago as she was hot, she woke up crying and I have took her temp again and it's gone up. Does this sometimes happen?