Answer & Explanation:
1:
One reason you may feel tired is because your body is fighting off the disease/infection/sickness. There are many ways the body fights it off, 1 way being fever. Fever makes the infection burn itself to death. A side effect of fever is tiredness and chills.
2:
Drinking lots of fluids and taking the right medication. For example: if you have fever take a Tylenol or Panadol.
Colds:
The common cold is an infection that affects the upper respiratory tract (esophagus throat, mouth, nose area). It causes issues with mucus and may cause throat aches. There is no cure for the cold but it can be treated with citrus (oranges, cough drops, etc). The average person has about 2-3 colds a year, they can be brought on by weather changes, especially in the fall. The body can get over the cold in anywhere from 1-5 days. Some individuals will have worse symptoms than others.
Hope that helps