Hey! Sometimes these symptoms come due to the nasal blockage during cold/fever
which usually is temporary and passes off as the respiratory tract
infection gets cured. For the dryness and unpleasant feeling in your mouth, you can try sucking lozenges and take adequate amount of liquids. In case the symptoms persist, you can suggest your family physician to investigate on the fitness of your salivary glands. Also you can try some antiseptic gargles.