Daily temp changes through out the day.

DAily temperature variations from 97.6 to 99.8 ,from 2  mnths,earlier widal o&h 1:40 after 5 days it is  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 4 th  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,pls help doctors,morning after 10 am increases to 99 , afternoon 99.4 sometimes 99.8, night it becomes to normal 98.4,which hormones are responsible in maintaining the temperature of body ,pls explain doctors ,or it is due to thypoid,doctors saying it is not thypoid,plshelp