Hello, It may be a viral infection, you need to take good amount of liquids daily. If having fever persistent then blood investigation may also be required. Take tablet cetrizine 10mg twice a day for cold and take cough syrup ambrodry if dry cough or Ascoril syrup if wet cough 2 tea spoon thrice a day. Eat fruits, juices, green veggies. Hope this might be helpful to you.