Thank you for your query on Healthcare Magic,
Difficulty on walking with pain followed by fever
and on CBP elevated WBC may be because of some bacterial infection like septic arthritis
or a urinary tract infection
with a reactive arthritis
may be a possibility.
I advise you to continue the medication as prescribed by your doctor and be in regular follow up to find the progression of the problem and appropriate intervention whenever required.
Hope I have answered your query.