Temp vaies due to what? Past 10 days!

DAily temperature variations from 97.6 to 99.8 ,from 2  mnths,earlier widal o&h 1:160 ,during this also same pattern of temperature,taken antiboitics like gudcef,azithromycin,ornio,moxinow,doxt-xl for 20  days,widal o&h 1:40 but fever pattern is same ,doctor stopped antiboitics for 1mnth then also same,thyroid normal,chest x Ray normal,us abdomen normal,mantoux normal,Esr 26 in may now in June it is 10,crp 6,blood culture negative,smear for mp negative,widal igg&igm negative,scrub thypus negative,RF assay negative,visted so many doctors all are saying it is normal when temperature is above 100 it is fever what else I should do ,I'm male due to which factors the temperature will varies,now it varies in between 98 to 99.5 from past 10 days