Your description suggest more in favor if some lung infection
. Mere giving amox may not work. If first attempt of treatment is not effective, better go for some investigations like X ray
chest, blood counts etc after consulting your chest physician. You did not mentioned about smoking
status, If patient smokes best thing to do right now is to quit smoking and then go for further evaluation. Also check for insect bite marks over body, as there a some infections which often occurs in forest dweller and they usually do not response to usually prescribed medicines.