ALWAYS . . .

Treat a fever with fever reducers, and go find out why you have the fever.

Fevers will cause a psuedo exacerbation (which can let up when the trigger, like overheating, is removed), or result in a REAL exacerbation, if the fever is due to infection that is untreated.

New or worsening of existing symptoms, lasting longer then 24 - 48 hrs (in absence of still treatable infection), means you are in an attack. It sounds more like you have infection though (because of the fever), so go find out what it is and get treatment. In the meantime, keep your fever in check.

Cherie