Hi there..rhinitis and fever are very common. They usually subside on their own in a week or two. But sometimes they can persist for a long duration if the infection is severe. At home you can take steam inhalation and do salt water gargles. Have plenty of fluids and take rest. For sinusitis you will have to given antihistamines and for severe paracetamol. If the fever is severe, then you will have to be investigated to look for any sign of infection and start on antibiotics accordingly. So kindly consult a general physician for further evaluation.