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of a person gets raised whenever there is any sort of active infection in a human body and even it increases in anaemia
.ESR of 63 is definitely high.Since your X-ray and rheumatoid factor
is normal i guess the increase in ESR ia due to fever
which you have.Cefixime
is an antibiotic so see if the fever subsides in 3 days then may be you can should continue it for another 2 days making it 5 days.After the fever is gone may be after 2 weeks you can repeat the ESR and see if it comes to normal fine but if it remains high you need to consult your doctor again.