Fever is not an illness: It is simply a raised body temperature,and usually a sign of some form of infection. But what should you do about it???

"Is it important to keep warm when you have a temperature?"
You should not allow yourself to get too cold. On the other hand, there is no need to pile blankets on the bed or heat the room to oven temperature. Rest, be as comfortable as tou can, and your body will do what is needed.

"When I have temperature, I shiver one minute and sweat profusely the next. Why is this?"
In a fever, the temperature not only goes up, it swings up and down much more than usual. As it is on its way up, people experience shivering chills, which may be so intense as to cause uncontrollable shaking attacks, called rigors. As soon as the temperature starts to fall again, there is a lot of sweating.