When fever or pain increases

If fever rise or pain increases:

بِسْمِ اللَّهِ الْكَبِيرِ أَعُوذُ بِاللَّهِ الْعَظِيمِ مِنْ شَرِّ كُلِّ عَرَقٍ نَعَّارٍ وَمِنْ شَرِّ حَرِّ النَّارِ

"I seek relief taking Allah's great blessed name from all the evils of pulling (pulsating) nerves and from the evils of the hot fire".

(Tirmidhi)