welcome to healthcare magic,
it is quite a normal phenomena after some viral or bacterial gastoenteritis .ESR nad crp may be high with low WBC count due to bodies inherent immune mechanism.it usally get back normal after a few weeks. review your FBC later.if this abnormalities persists,malabsorption syndrome
like celiac sprue
must be considered.and several special antibodies
, called antitissue transglutaminase
antibodies (tTGA) or anti-endomysium antibodies (EMA) may help this diagnosis.