Temp variations in a day. It is normal!

Temp variations in between 98 to 99.8 from 2 months at first widal negative after 5 days widal o&h 1:160 taken antiboitics like gudcef 200,for 5days,ornio 3 days,azithral 500mg 5 days,moxinow,5days,during these fever in between 98 to 99.8,blood tests smear for mp negative,esr 25 ,thyroid normal,bp normal,after 5 days widal (-) ,stopped antiboitics for 1 mnths but still fever pattern is same morning at 9am it increases to 99 at afternoon increase to 99.8 evening after 9pm decrease to 98.6,next on 50 day mantoux negative,smear for mp(-),crp 6,esr30,urine normal,cheat x ray normal,us abd normal,esr 30 , antibiotic doxt-xl taken for 5 days next day blood test done ,esr 25,widal card igg&igm negative,widal o&h 1:40 ,blood culture negative no organism found,after 1 week again went to doctor blood tests crp 6,esr 10,scrub typus negative,rh factor assay negative ,mine appetite is good ,will any vitamin deficiency leads to this variations in temp ,visited so many doctors saying it is normal