Hello
You mentioned in the query that your wife is taking( mefanamic 500 mg+
paracetamol 325 mg),
azithromycin + cefpodozime twice in day but you didn't mention the duration of treatment .
Nausea ( vomiting ) anorexia are due to the side effects of these drugs as all these drugs causes hyper acidity so either take antacid syrup ( if oxetacaine then the best ,because of local
anesthetic effect provide instant relief in nausea or vomiting).
As you mentioned that in spite of these medicines , still fever present ,so please consult your treating doctor or else consult another physician for establishment of diagnosis .
Fever may be due to , malaria, viral ,
typhoid fever , flu , jaundice , if from very long period may be due to
tuberculosis .
In my opinion consult one more physician and get his opinion ( 2nd one).
Good luck.