High grade fever with headache , body ache
could also be due to viral fever
which is self limiting in about 5 days with crocin, bed rest
and plenty of fluids to drink. However since your doctor has personally seen you and examined you , you may be doing the right thing by continuing with the medication. Lumerax is an anti malarial drug and cefixime
is an antibiotic.
Get well soon :)