Question

why i am experencing fever,cold and weakness and how to overcome it

Answer 1

take medicine theg may suffer due to climate change
take advise of a doctor

Answer 2

fever is the sign of inflammation in your body. an in slimmetry response can be triggered by infection such as flu virus or by immune related disease. some Chemicals are evolved from the body during this time from them body temperature increase such as 102 Fahrenheit.
you can overcome it by various methods
❇ bed rest
❇ keep hydrated
❇ up your Vitamin C
❇ keep cool
❇ SIP warm liquids
take it easy! u will cure fast