What are the possible causesolow grade fever bet 99-99.5 , severe headache, raised esr 100 in a 58 yrs old lady.she is diabete Ic on oral hypoglycemics and htn, hyperlipedemia on treatment.all her symptoms are from last 2weeks.labs , urine normal, ct brain showing sinusitis.she took antibiotic and cbz afor headache dxsed as trigeminal neuralgia.kindly reply