As all your tests are within normal limits still recurrent cough
and pyrexia troubles you it calls for further investigations. The locus of cough in such cases can be abdomen, lungs or throat.Taking it to be PUO with kaphaj imbalance In herbal medicines we recommend sy. crux 2 tsf bd and tab.maha sudershan ghan vati 2 bd. Take hot water avoid cold
things and curd. Kanth sudharak vati can be sucked.