Hi and welcome to HCM.
First you need to find cause and then treat it. Antibiotics wont be helpful if there is no bacterial infection. Prolonged fever
can be sign of many diseases,not just infectious one. Also paracetamol
is just symptomatic therapy and also it damages liver
when uses excesively. If there is no sign of infection(most common are respiratory and urinary) then some reumatic or autoimmune disorder can be considered. You should be cautious about fever control because this also doesnt treat the cause and can mimic primary disease. I suggest to do detailed lab and microbiology test, reumatoid factors and allergy
Hope I have answered your query. If you have any further questions I will be happy to help".