Swollen Lymp Nodes with 104 Fever. Do?

Hello Doctors I hope you are doing well My brother Ankur Panwar is 32 years old he was suffering from swollen lymph nodes and fever, we go for the CT neck, which showed multiple enlarged vital level ib, ii, iii, iv and v cortical lymph nodes are seen, largest is 3.5 cm in short axis diameter, we also go for the multiple FNAC but there was not any clarity in FNAC. We go for the many blood tests also. Doctor suggested us to start TB medicines from DOT center and it has been 2 months he is taking TB medicines but he is suffering from high grade fever since then and usually his temracture reaching 104. Last week doctor advised us to go for the CBC. In the CBC report his TLC count was 16000 and hemoglobin was 7.5. Doctor give some antibotics like tazomac and Udiliv 300,Perinorm and NS for five days. Now we go for the CBC test again but now TLC is 33300 with 8.0 Hemoglobin. He is still suffering from fever usually develop 2 to 3 times fever in 24 hrs. Please advice what should we do?