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If you have just heat of body and if the temperature checked by thermometer is normal then the heat of the body can be due to weakness.Also the headache is due to weakness and is called fatigue
headache.So for headache and the body heat you can take a Paracetamol
tablet for temporary relief and for weakness get checked for anaemia and if the haemoglobin
is less then you have to start on Iron and folic acid
tablets to recover from anaemia and also you need to take multivitamin
and minerals tablets for weakness.So consult a local doctor and get prescribed.