Sir my father is having fever for last 2 3 days and we have got him tested and its covid negative...But he has a persistent fever which arises after evening 7pm everyday and he is feeling weak and low. His head remains hot and mostly the fever arises by 7pm evening and goes upto 102°C till 10pm.. He has been taking paracetamol tablets and some vitaminC tablet and then fever goes away for 3 4 hours but he feels warmth inside .Plz help sir.